Ian Kemp, Peter Carter and Dave Rolfe carried on fitting oil, water and fuel pipework to the ex-50008 power unit, but on the side facing Renown, so no photo opportunities were possible today.
In preparation for the open day on June 21st, I washed down the outside of the electrical cubicle frame in 50030 and undercoated it, as it had become dirty from repeated handling since it was originally painted about five or six years ago. I also cleaned and undercoated the two cubicle doors from the fuse and MCB compartment. I brought three more cubicle doors home to clean.
Just a reminder that we are having our Open Day on the afternoon of Sunday June 21st where RRRG members will be on hand to give guided tours of the project and discuss progress. We hope to see you there!
Ian Kemp, Peter Carter and Wes Needle continued fitting coolant and oil pipework to the power unit, while Dave Rolfe carried on painting the other side of the power unit.
I removed the battery charge contactor so I could clean and undercoat the compartment where the CU2 and CU7 go, then did the same for the compartment underneath where the CU1 sits, in readiness for having them temporarily fitted for the open day. Topcoat will be applied next workparty. I also cleaned the dirtiest two of the cubicle doors ready for painting.
This article came about after a discussion between myself and Dom Jackson, and is intended to give an idea of the difficulties and problems faced during rebuilding of the electrical cubicle in 50030 Repulse.
When we acquired The Twins, I had already discussed with our original Chairman Paul Taylor where my skills and interests lay, and as such, at the first work party in November 2002, he asked me to go through both locos to see which had the most complete electrical system, which would give him an idea which locomotive would be the most viable to begin work on. Having never been inside a 50 before, I didn't really have any idea what to expect, but I was shocked at how little remained of the electrical systems of both locomotives. After inspections by various people, the consensus was Repulse was in better overall condition, and so it was decided she was to be restored first.
The electrical cubicles of both locomotives were totally stripped, with the exception of nine of the 18 NR28 relays left in Renown, and I soon realised these had only survived because they were at the far end of the Thin Man's passage, in the most difficult compartment to get at. Both locomotives had various terminal bars missing, and there were cables hanging and lying everywhere.
Paul asked me to be his electrical officer, but I remember telling him that unless he could obtain detailed wiring manuals, there would be little chance of me being able to rewire the cubicle as I knew little about 50s at the time. He assured me he was getting copies of the manuals, so I gave him the benefit of the doubt and agreed to come to the next few work parties to start clearing the debris from in and around the cubicle.
One of the first tasks was to install fluorescent lighting in both locomotives so we could see what we were doing, and a few weeks later Paul made good on his promise and presented Mark Tinker and myself with copies of the wiring manuals, and I duly accepted the role of electrical officer. Mark Tinker was actually a qualified electrician, but decided the formal post of electrical officer wasn’t for him. One of the manuals showed the positions of the various electrical items in the cubicle, and the other gave details about what each piece of equipment was connected to, and with what cables. There then followed several weeks of poring over these manuals, and I began to have an inkling of what went where, though at that time we had no electrical equipment, so I didn't know what most of the items looked like. Mark and I began by trying to read and identify those cables that still had readable markers on them, adding our own labels written on masking tape. We were helped somewhat by many of the cables still being tied in bunches, so we were able to start placing them in approximately their correct positions.
We visited MoD Bicester to see the work Paul Spracklen was doing on 50026, and he agreed to sell us some of his spare electrical equipment. However, once I was able to examine it in more detail back at Rowsley, it quickly became apparent most of it was really only useful for spare parts. It was heavily corroded, with many missing or broken parts. We had also by then managed to obtain a quantity of NR28 control relays, so I decided to start cleaning and installing them. Shortly after this I found a supplier in Birmingham for the correct BR-spec cables. The actual manufacturer was still Brandrex, the distributor now is Anixter. Fortunately, all the cable sizes we needed are still used in the railway industry so, whilst expensive, they were readily available. To date I've installed just over 900 metres of control cabling into the electrical cubicle in 50030. A short while after this, we managed to obtain much of the electrical equipment we needed when the owner of 50023 Howe decided to sell up. This time the equipment was in much better condition, and after stripping and cleaning, was ready to be installed. I attached all the control cables from each piece of equipment as it was fitted, and laid them in to their approximate destinations, carefully marking each cable with masking tape. In this way, by the time the last piece of equipment was fitted, all it's control cables were already there. On the occasions when Mark was not there, Neil Favell gave me much appreciated help.
Cable lengths vary from less than a metre, to six or seven metres depending on how far apart the items to be connected are, and the route you have to take through the cubicle. This means that on the days I had help, we were often able to install up to 20 cables, whereas on days when I was on my own, I'd be lucky to do half that.
A further visit to where 50026 was based after it left MoD Bicester revealed their spare electrical cubicle retained all the compressor, exhauster, earthing and neutral cabling, and many of the required insulators. A deal was struck and we purchased the cubicle frame, which I stripped of all the cables and insulators and fitted them into Repulse.
Part of the haul from Howe gave us the missing cubicle terminal bars which, after cleaning, were fitted into Repulse. This allowed many of the original control cables that we had identified to be reconnected, and all of them have now been done. Refitting and reconnecting these terminal bars however in the Thin Man's passage, takes a terrible toll on the knees, with the combination of very restricted space and the chequerplate flooring.
Wiring the NR28 relays with the new cabling also presented its difficulties at the far end of the Thin Man's, as the compartment is small, dark, at shoulder height, and the relays are quite close together. In contrast, the other nine NR28s behind the cubicle switch door are much easier to get at, as the floor level is higher and there is a much wider passage to work in.
The cubicle switch door we obtained from Paul Spracklen was missing all four of the rotary switches, and only retained the ammeter, fuel priming and local start push buttons. I enquired with several 50 owning groups, but they either had no spares or were unwilling to part with any spares they had, which was quite understandable. Fortunately, one elec manual showed the manufacturers of each electrical item, and I saw the rotary switches had been made by a company called Santon, who I was already familiar with from when I worked for an industrial electrical manufacturer, as they were the Midlands distributor for Santon. And yes, it's the same company that makes electric showers!
I contacted Santon and asked if there were modern equivalents for the four we needed, and to my surprise, when I gave them the part numbers, they told me all were still current stock items! Just goes to show that if you have a good robust design, why change it?
These four switches were not cheap by any standards, the largest one costing almost £200 itself, but we needed them so their purchase was agreed and they duly arrived. After fitting them I laid in all the cables from them, no less than 57 separate cables.
By the time it came to fit the compressor and radiator fan contactors, the larger cabling we had obtained from 50026 was already there and just needed connecting up. Obtaining the large curly ballast resistors on top of the cubicle took some time, and when we finally got them, it took both Mark and I with our heads up against the roof to fit them and connect the cables.
In front of the large field divert resistors on top of the cubicle are the 18 smaller green resistors which are mostly to operate the various cab warning lights. These lights are always on dimly, and glow bright if a fault occurs. This also ensures that if a fault light is not lit at all, the lamp has blown and needs changing. After we obtained these green resistors I then had to attach all 76 cables to them which, as with the rotary switches, took several work parties
When we went to fit the first of the three main field divert contactors, it wouldn't fit through the front of the cubicle frame however we tried to manoeuvre it. In the end I had to take off the small metal block where the air pipes are connected and re-attach it after fitting the contactor. I then had to repeat this for the other two.
Attaching the auxiliary control wiring to the front of these contactors was relatively easy. However, when it came time to install the 12 large cables on the rear of these boards, it was a different matter. We had purchased these cables from Paul Spracklen and they had lain in storage for some time. As we were fitting them in the middle of winter, not only were they stiff from the cold, they had become accustomed to their prone positions and were very difficult to get into place. In the end it took both Ian Kemp and Chris Thorn to help me get them installed, and again took multiple work parties.
Fitting the traction motor contactors was equally difficult as they are large and heavy. In one case, I had to drill out the mounting holes in the cubicle frame to a larger size, as they didn't line up with the mounting holes on the contactor itself! These six contactors have large 'Faraday-cage' type arc chutes, of which we initially had none. We did subsequently manage to obtain several, and a large box of parts from which Steve Tripp and I were able to make several more. Putting them together was somewhat difficult, as you need multiple hands, and one slip and it all falls apart and you have to start all over again. Wiring the auxiliaries on these contactors requires you to lie down in front of them as they are located very low down in the cubicle frame, almost at floor level, as trying to do it by kneeling and reaching down almost cripples you.
On the board that houses the fuses and circuit breakers, the rotary Motor Control Switch was missing. This enables pairs of traction motors to be switched out in the event of a motor failure. We obtained one as part of the haul from Howe, but some of the contacts at the rear were found to be broken, so it was wrapped up and laid aside. A couple years later during a discussion with Steve Tripp, he decided to see if there was any way the broken contacts could be repaired. As we had just been fitting motor contactors, he realised what I hadn't; that the contact blocks were the same kind as the motor contactors used. We were therefore able to take parts from a spare contact block and repair the switch, which was subsequently fitted and wired. On the fuseboard itself, all the fuses were missing, but all the MCB's were present. We have since obtained all the fuses that we need for Repulse, and have a few spares. Re-connecting the cables on the back of the fuseboard was not particularly difficult, as that is one of the few areas where there is plenty of space.
The two large main starting contactors were obtained as part of the Howe equipment, and they were relatively easy to fit and wire. However, we have no spares or any for future use in Renown. These differ from the other contactors in the cubicle in that they have much bigger coils than any of the others and have connections for the large power cables from the batteries.
Of the boards that go in the Thin Man's passage, one is very heavy, having seven contactors on it, and it took both Mark and I to fit it. Once fitted, the contactors are very close to each other, and wiring them was very fiddly as access is very limited. The other four were relatively easy to fit and wire. The board that fits behind the fuseboard was somewhat difficult to connect up, as it's difficult to connect the cables when the board is actually bolted in place. Mark had to hold the board at an angle in front of its position, while I reached over to connect the cables, then it could be mounted on the bolts and fixed in place. On the board that houses the field divert relay, there is a long green resistor mounted above it. We didn't have one, but the 50021 Loco Association kindly gave me one of their spares. However, this turned out to be open circuit, and I was not able to source one from anywhere else. We did have various other similar resistors we had got from 37s at Booths, so my father suggested I make what is known as a 'ladder network' of smaller ones that come to the same total value. I did this and mounted it on a board in the redundant space next to the start contactors.
A couple of years ago we were fortunate in obtaining a spare electrical cubicle from the 50021 group, which had some equipment and much of the larger exhauster and compressor cabling still in it. It has all been removed and stored for possible future use in Renown. We also obtained a genuine 50 reverser from the owner of Howe, but by that time we had temporarily fitted an ex-37 example, so I could get the six large cables from the divert contactors, three from motor contactors 1, 2 and 3, one from the field divert relay and one from one of the start contactors, into their proper positions. While the main cam mechanism is identical, the auxiliary contacts are completely different on a 37, and were incompatible. Chris Thorn offered to make a second set of auxiliary contacts, copied from the original, for future use in Renown, so we left the 37 reverser in Repulse until he had done this. As a result, the 'proper' one was only fitted into Repulse and connected up in 2014. However, these reversers are large and very heavy, and it took four of us to remove the 37 one and fit the proper one. We have two spare reversers in total, one of which now has the duplicate set of correct aux contacts Chris made.
I am at present re-installing the plastic control air pipes between various equipment in the cubicle. As soon as I started it became very clear I should have done it before much of the wiring was installed, as I'm now having to work in very restricted spaces around and in-between bunches of cables, and trying to get spanners in is extremely difficult. I have also set about identifying the remaining severed cables under the floor around the electrical cubicle and generator room of 50030. The second part of this article will describe our work in sourcing the electronic control units used in a Class 50, as well as the remaining work required to complete 50030 in electrical terms.
During the work party of 19th April Andy Rowlands connected up the reverser air piston coils and tidied up the cables in the electrical cubicle in 50030, then started investigating the severed cables under the main cubicle walkway. They appear to be from the DSD relay box but further investigation will be required to trace them exactly.
Peter Carter and Ian Kemp together with Dave Rolfe continued fitting oil and water pipes to the ex-50008 power unit (see previous report, Power unit progress) in continued preparation for its use inside the overhauled 50030.
Recent work in the cabs of 50030 has been concentrating on freeing off the power controllers. Ian Kemp and Dave Rolfe have sprayed them liberally with WD40 and worked them backwards and forwards. As a result they move for the first time since 1992, albeit rather stiffly in the case of no 2 end controller at the moment. Andy Rowlands fitted, tightened up and reconnected the cables on the replacement set of contacts Dave had removed from one of our spare power controllers, to replace the set found to be broken during our freeing-off of the controllers. To achieve this you need to unbolt the plate that holds the sets of contacts so it swings away from the cams, and refitting the bolts that hold the plate is difficult as the contact springs keep pushing the plate away from the cams, which makes it not the easiest job when hunched up under the driver's desk and you need three hands!
The controller in no 2 cab is still quite stiff despite repeated applications of various lubricants, but the one in no 1 cab is much easier to move. If we cannot make them easier to rotate, we may have to look at removing the entire controller pedestals and dis-assembling them totally to see if the nylon bearings need replacing.
Ian and Peter Carter oiled the main big end bearings and barred the engine round. Andy Rowlands has also been working to refit the reverser air piston in the electrical cubicle of 50030.
Ian, Pete and Dave spent the day unfastening the bolts to allow the main generator fan to be removed. The fan is between the generator and power unit (but bolted to the main generator itself) and is normally hidden by the surrounding cowling. It sucks in cold air from under the body to help cool the gen and the cowling keeps the air circulating round the gen rather than blowing it all round the engine compartment. It has to come out to give access to the next layer of bolts that actually connect the engine to the generator. This proved to be a very fiddly task in the limited space between the fan and engine block. Ian is seen proudly displaying his dirty hands after the day's work!
Mark brought two of the refurbished KV10s, paperwork, test sheets and circuit diagrams up to site. After a test fitting they were removed once again! Dave, Pete, Ian and I hoisted one of the intercoolers up onto the ex-50008 power unit and bolted it in place. The other is ready to be refitted but needs painting first. Dave started making a hoist arm to be fitted on a corner of the container over the workbench. I started fitting the cubicle air circuit pipes, which was somewhat difficult with all the cabling in place, so if I ever do that again, the lesson is fit the airpipes before the cabling, then the cables wouldn't be in the way!
The new airpipes are just visible in the photo below, between M4, M5 and M6.
I discovered the air connections on the reverser air cylinder are a different thread to all the others, so I brought it home with me to take to the supplier I got the other fittings from to see if they can provide the correct-thread fittings for it.
A good day on site today. Former regular working member Wes Needle joined us for today's workparty. Since getting married and starting a family, Wes hasn't had much time to indulge his chosen hobby, but because they had taken a break in a holiday cottage not far from Rowsley, he was able to take a day to join us while his wife Keren and the nippers went on the train.
Dave Rolfe continued cleaning and painting power unit pipework, then he, Wes, Peter Carter and Ian Kemp finished overhauling one of the intercoolers and reassembled it. They also started unfastening one of the compressors on 50030 ready for it to be removed as there is an overhauled one ready to take its place.
I located the fittings and tubing I had purchased some time ago to replace the air circuit in Repulse. There are different threads that have been used on these fittings at various times, so it was a bit of a gamble whether we had chosen the right thread, but fortunately when I tried the fittings in the motor and divert contactors, they screwed in fine. I had made a diagram some time ago of the routing and connections of the air circuit in 50021, so I am now able to copy it in Repulse. I also finished off connecting up the newly-fitted reverser in the electrical cubicle of 50030 with all its wiring and connections. Even the weather was kind to us!
Here are some photos from the ongoing restoration of the power unit we acquired from 50008 back in 2006. This power unit is being restored with new internal components to restore it to effectively "zero hours" status and will be deployed into 50030 Repulse once completed. The power unit currently inside 50030 will probably be reused in 50029 Renown in due course; the engine inside Renown suffered serious damage when the B4 cylinder seized. This was the cause of 50029's withdrawal from BR service in early 1992. The main generator on the ex-50008 power unit is in good condition as is that on the damaged block inside 50029; 50030 suffered a main generator flashover and we plan to perform a generator swap with 50029 at some stage to create a good power unit/generator combination.
This set of pictures shows again the level of commitment RRRG is investing in the rebuild of 50029 and 50030. We intend 50030 to re-enter traffic by 2017 as effectively a brand new locomotive with fully overhauled internal parts and to ensure it a very long and secure future in preservation. The same policy will be applied to 50029 when the time comes.
RRRG Officer Mark Burrows recently visited our electrical contractors to view progress on a number of electrical machines we are having overhauled for use in 50029 and 50030. Here are some pictures of the work we have in progress on electrical machinery.
We have amassed a number of "duplicate" electrical machines over the years, partly with the intention of locating better condition items than are already inside 50029 and 50030 (the major electrical machines are intact in both locomotives but in poor condition after years of disuse) and so reduce the cost of overhauling them as well as the cost of extracting the machines from inside the locomotives in the first place. For example, in addition to the exhausters inside 50029 and 50030, we have two others currently with our electrical contractor. One was obtained from a scrap Class 37 at Booths and the other was purchased in almost fully overhauled condition from Unipart Rail some time ago. The latter had been in store for some considerable time and had deteriorated slightly as a result. Both of these are now finished with the ex-Booths machine having had an oil leak repaired and the ex-Unipart motor blower having received a light overhaul to bring it up to the "as new" standard we are aiming for with our restoration project.
|Two overhauled exhausters seen in April 2013.||A traction motor blower which is at an almost complete stage of overhaul, waiting only for a new bearing before it is complete.|
Each of the electrical machines we send for overhaul and refurbishment is fitted with new brush gear as illustrated in this close-up of the fan motor in the newly-overhauled traction motor blower, and the opportunity is also taken to refurbish the "snail" casing for this machine.
|Close up of the fully overhauled brush gear in our overhauled traction motor blower.||The "snail" fan casing from the motor blower has received an overhaul and respray too.|
A full set of pictures from the visit can be found in the RRRG image gallery.
Renown Repulse Restoration Group has placed an order with a noted locomotive electronics expert for testing of a CU1 main control units and the rebuild of KV10 load regulators using modern components. The CU1 acts as the "central brain" of a Class 50, receiving and sending signals from and to all the other electronic control units in the locomotive. There are two KV10 load regulators in a Class 50, one is denoted CU3 and controls the main generator output. The other is denoted CU6 and controls the ETH generator. A KV10 is transformed into a CU3 or a CU6 by means of pairing with a control card CU3A or CU6A.
As with many electronic components of the Class 50, the KV10 design is full of obsolete components and with an eye to the future we feel this work is essential to our goal of "future proofing" 50029 and 50030 and ensuring them a long and secure future in preservation. The original design suffers from a tendency to "lock on", whereby faulty circuitry causes the CU3 to lock in the full position even if the power controller is at its minimum position. The only real solution is to repair the faulty circuitry but that repair knowledge gets ever more scarce with the passing of time. As a result, we feel that the decision to purchase four rebuilt units (one main and one ETH generator control unit for each of 50029 and 50030) is money well spent.
There are actually two sub-types of KV10, denoted B1 and B2 with slight differences in component types. RRRG has over twice as many B1s as we do B2s but our stock of CU3A and CU6A cards are only confirmed to work with B2 type KV10s. The rebuild process uses only the case, heat sink and thyristor from the original KV10 and as a result the control cards become obsolete as the components they contain are now integrated into the main unit. We intend to supply type B1 KV10s for the rebuild project with a decision on disposal of the type B2 units and control cards to be taken at a later date.
The following two shots show a rebuilt CU6-type KV10 installed in 50008 Thunderer. The first shot is taken from the Thin Man's side and the second is opposite the exhauster. Click on either to enlarge (opens in new window).
Needless to say, this work will not be cheap and we really need the support of the preservation community. Perhaps you could donate to our project, or become a member of RRRG and buy shares, or browse our online shop for items of interest? Your support is what has got us this far already and it is much appreciated.
As long-term followers of RRRG will know, for some time now we have been investigating the remanufacture of CU2 field divert units to replace the ones missing from our locomotives. Our contractors for the job, Industrial Electronic Services Ltd, had analysed a genuine CU2 kindly loaned to us by another Class 50 owner and were confident they could reproduce the circuitry and components in the unit, using modern equivalents where possible/necessary. They had however hit quite a snag when it came to replacing the little relay in the original unit. The CU2 is a really amazingly compact piece of equipment for mid-1960s electronics as seen in the photo of the loaned unit below. The relay in question is the small black box seen in the centre of the picture. It switches at the operating voltage of Class 50 auxiliaries, namely 110v DC which brings about the problem of how to find a modern equivalent. Electronics is obviously one area where technology has progressed leaps and bounds in the near-half century since the Class 50 was constructed by English Electric and relays to operate at such high DC voltage, let alone such compact ones (it appears the original was custom-made for EE by ITT) are almost completely obsolete these days. Most modern relays, even of a size too big to fit the case, would burn out very quickly if asked to switch 110v DC.
We thought about various ways to overcome the problem. Inverting the current to AC, using an AC relay and then rectifying it back to DC was suggested but dismissed as impractical. 50030 Electrical Officer Andy Rowlands suggested using a spare NR28 relay, as used elsewhere in the locomotive to switch 110v DC. It wouldn't fit in the box for the CU2 (and the CU2 is deliberately designed to be compact as it fits into a very tight space in the cubicle) but Andy reasoned it could be mounted externally and wired in. We supplied IES with a couple of NR28s to test the theory and they agreed it would work but felt the new divert unit would need some circuit modification if it were to be used. IES decided to have another look at the relay market and managed to source a relay from the US which has a 24v coil and can switch up to 220v DC. IES ordered a number of these relays on our behalf and have now advised us that they have arrived and appear to work fine in our 110v DC application.
We now expect progress to be rapid on the rebuild of these electronic units. IES have invited Andy to inspect the new relays in person the first week in March and if approved by us, IES expect to finalise the design within the next couple of weeks with production of the two units requested following imminently thereafter.
A full description of the electronic units in a Class 50, and how many of each type RRRG has, can be found in RRRG newsletter Issue 23 (Autumn 2011). Since that article was written, we have acquired one original CU2 from another Class 50 owning group however we still intend to have two units built by IES to cover for possible future failures.
Sarah and I attended site and again met on site by Dave who I now think lives on site full-time as he is always there :-)
Dave continued with clearing and tidying the container a job that when he started thought would take a morning ended up taking three days. Once this was completed he continued with the refurbishment of the radiator grilles. The process takes such a long take as each element is being stripped back to bare metal, prior to priming and painting, and as BR's policy appears to have been apply new paint onto the old there are numerous layers of paint and a rainbow of colours.
Sarah & I continued with the assessments of the KV10's. Starting with the best we are checking and cleaning contacts and replacing unserviceable parts. We have finished one complete unit having to re-terminate a couple of broken cables connections and replace a couple of components. The next best KV10 selected had sound looking components but the cable terminations at the top of the unit looked a little rusted and three of them sheared off when attempts were made to loosen them even after liberal application of WD40 (other lubricants are available lol). Therefore we had to loosen of the paxolin board from the body of the KV10 and using recovered termination studs from other scraped units these were replaced but this is not easy as unless you disconnect cables going from one side of the unit to the other side the board only gives finger width space.
Our next visit to site to continue with work on the KV10's will be in a few weeks as we will be participating in a railtour with EE Type1's and a couple of galas where it's hoped to sample a certain Mr Spracklen's 50026.
Myself, Sarah and Toby the dog attended site and the usual weekender Dave was there when we arrived. Dave spent the Saturday erecting a shelving unit the group acquired courtesy of one of our volunteers employers (enough said) and having a general tidy up.
We spent the day working on assessing our KV10's. A couple were found to have damaged PCB connectors, I have found a source for acquiring replacements.
I found another 10-12 conduit and pipe clamps that I need for in the generator room. I cleaned these up with wet and dry sandpaper and a wire cut brush, then white spirited them and painted them. Also put another coat of paint on the 40-odd clamps that I did last time I was on site.
I also re-secured 50029’s tarpaulin which was loose and flapping around a bit on one corner.
Dave Rolfe was on site as usual and continued with painting a second coat of paint onto the radiator grilles. I took a few photos and noted how good they were looking; we will share these here soon.
Dave was on site all weekend working on cleaning and painting one of the bodyside radiator grilles.
Ian and Pete with some assistance from Dave continued working on the ex-50008 engine replacing some of the head covers.
Steve and Sarah assessed traction motor contactor arc-chutes so spares and paxolin to replace missing parts can be ordered.
The long process of verifying all the cables from the electrical cubicle to equipment in 50029 was started. Each cable was to be tested with a multi-meter to confirm continuity. The first cables checked were those from terminal bar TB6 with blower No1 cables testing out ok. Problems were then encountered as we checked Blower No2 but could get no reading and eventually realised this was because the cables and flexible conduit had been cut about an inch from the connection box.
As it is too difficult to pull any slack through we have decided to dismantle the conduits with a view to reinstalling via a shorter route up the front of the blower negating the need to replace the cables.
Preliminary discussions have been engaged in with a good contact who can overhaul KV10s. RRRG has a good number of both KV10s and their control cards in our possession but we have no idea if any or all of them are actually serviceable! For the uninitiated, a 50 has two KV10s: one controls the main generator field strength and the other the ETH generator field strength - the difference being the control cards in the KV10 which define its function (main or ETH generator). We understand this same contact can overhaul CU1 control units (the "master brain" of a 50) and we hope to have more news on these electronic component overhauls in a month or so.
The old RRRG website was a cutting edge design... for the late 1990s. As a result it has been sent to Doncaster Works for a total refurbishment and is expected back in traffic later this year. Meantime we have set up this site to provide news, views and project updates until such time as the refurbishment work is completed.