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Decoders: "Walk thrice round the room widdershins and don't think on a fox tail"


Ravenser

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[What with a new job and sundry other distractions I've been pretty quiet on here for a while, though a certain amount of modelling has taken place. This entry has been sitting unfinished in draft status for some months - rather than delete the thing I've finally tidied it up and released it into the world out of its time slip....]

 

I had the layout up and the result was a bout of decoder fitting and test running. And I'm beginning to see why some folk view DCC as black magic.

 

Four locos or units were involved, plus that long-term problem child the West Yorkshire 155.

 

First up, the little Hornby J50 which I bought at Ally Pally because I thought the bank might pull the plug on Hornby in the near future so this might be the only batch of the models we ever see. I managed to get a late crest loco for a decent price off Hereford Model Centre - this is a J50/4 and a little online checking reveals that 68982 was at Immingham, Colwick, and Frodingham , probably the only J50/4 with a long term E. Midlands career, most being London engines. Possibly I should have got an early crest J50/3 instead, but the deed is done, and at some point I shall renumber - I just hope that the transfers I have match Hornby's printing and I only need to change the last digit

 

I had a TCS UK direct plug decoder in stock, so that went in, there was no need to remove any weight,and it runs very nicely.

 

I have previously toyed with the possibility of using a station pilot when Blacklade runs steam - I have a GBL Jinty and Hornby chassis in stock and wondered about giving them something to do. Once all the decoder fitting was completed I had a kettle operating session and I found that having a shunter as pilot substantially improves operation. It gives you an alternative way of releasing locos when you're boxed in, it's excellent for rearranging parcels vans and a very useful and interesting addition to operating . So I definitely don't regret spending the money: the J50 will see a lot more use than expected.

 

Here it is in the fuelling point having taken out the LNW set to release a kettle:

 

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I was also very pleased with the sudden improvement in reliability when running the kettles. The L1 ran an entire session without falling off, despite it's still unmodified pony truck, the LNW set ran without problems now a bearing has been eased, the MR set behaved itself perfectly and so did the parcels. I found the newly operational electromagnets under platforms 1 and 2 useful to uncouple locos , and generally it was a confidence-building session. The BR Blue period has worked pretty smoothly for a while - now the kettles are getting there, too

 

I'm even toying with the idea of resurrecting the elderly Bachmann 03 diesel which has been lurking in a drawer since Ravenser Mk1 was dismantled. It will mean hardwiring a decoder and fitting Kadees, but it's very small and I should be able to find somewhere for it to lurk amongst the Blue period stock. There's a Bachmann 08 hiding away in that drawer as well - from the first issue, so there's no socket and hardwiring will again be necessary.

 

Second up for a decoder was the Replica MLV chassis for the 128. This took a large Gaugemaster decoder, tucked in with double-sided sticky tape, and duly programmed. I found it a distinctly slow-running mechanism until I started doing some tweaks to the motor control on other locos and suddenly discovered that I had input max volts to CV5 as 128 when in fact the values go up to 255. In short I'd halved the maximum voltage... It's been corrected.

 

Third up for a decoder was the Fowler 2-6-4T which I bought second-hand at Ally Pally a couple of years ago. I took the body off to see what would be involved in hard-wiring the thing - and found that there was a decoder socket in the thing. If I'd known that I'd have had it up and running ages ago....
A Gaugemaster Opti Small went in this - and the thing barely ran. As it had run pretty happily when I got it (I took the precaution of testing it on the DOGA test track ) I applied a bit of lateral thinking and carefully oiled the valve gear and motion, and anything else that the service sheet said you should oil, using some .033" handrail wire to apply the oil. After two rounds of application, the Fowler tank ran pretty well, though it's not quite as smooth as the L1. I suspect that sustained use will help this over time, since friction in stiff motion is evidently the problem .

 

The Fowler tank has since received Kadees - another job which I'd been dreading, but which proved surprisingly easy in practice - and is in traffic, replacing the O4 which found the undergauged spot in Platform 3

 

The fourth loco to get a decoder was a Lima 37, picked up for a song at DEMU Showcase a couple of years ago because it was in two tone Sector grey and carried the number of the intended target loco. That - as far as I can now recall - got one of my last TCS MC2s, since it is a (straightforward) hardwired installation. As this is a vintage Lima ringfield mechanism - albeit a sweet-running one -the speed curve had to be tweaked to hold down the volts at the midpoint : this means that the loco is much more controllable in much finer gradations at lower speeds. In fact you have to get past speed step 90 before you are going to see any surge in speed. On an 8'6" long layout nothing ever gets turned up that far. Whatever may have been the case for Spinal Tap my PowerCab doesn't go to 11....

 

One problem did emerge during test running - a tendency for the unpowered bogie to derail in platform 3 (yes that bit of track again) . This was tackled by adding the weight taken out of the 155 when I rebuilt the underframe. Unfortunately this proved a bit too much for the motor to handle with comfort, and I resorted to cutting down the weight to about 2/3rd size with a hacksaw. Although a silver metal on the outside , inside it was a soft dark grey metal. It couldn't be lead, of course. After all no Chinese factory would dream of breaking health and safety regs by electroplating a lead weight to disguise what it was....

 

And so to the 155 , which simply refused to move when taken to the club test tracks a few months before. I put it on the tracks . I checked the programming . It ran fine . I checked if DC was enabled . It was. I have no idea why it refused to run on DC previously.....

 

(But the wretched thing still derails on a 3' radius crossover, so it needs a third attempt at inter-unit Kadees. I do have some Parkside mounting blocks to take NEM swallow tail sockets, and I hope that will solve the problem

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