And after deciding that it was simply not possible for the "interchangeable" DCC chip set-up to fit inside my tram engine, this is how it ended up:
The chip is simply sitting on top of the motor, held in place with a small layer of blu-tack. Who said that solutions needed to be over-engineered?
I've set up a "programming track" and successfully driven the locomotive back and forth. I haven't attempted to read or to program any of the CV values yet, as I want to get it running on a slightly longer piece of track to see what the ZTC unit does with the default values on the chip.
However I am mildly pleased that it all worked first time. Thanks to everyone for the advice on chips and DCC in general.
Cheers
Flymo
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