Thanks for your kind comments. Not long after my last posting, I bought a sound unit (on ebay) from mr rails. It took three weeks because, I believe, they are built to order. As I wanted the loco to operate on my 12 volt trailer layout - and fitting it all in the bunker - I ordered a 12V unit. It comes complete (see below) with everything you need and instructions. I've had it a couple of days and was raring to go after despatching several onerous domestic chores (stacking the turf, cutting down the docks and other weeds etc.). So I thought I'd photograph all the stages!
Below: The empty bunker.
Below: Everything just dropped in ready for testing and fine tuning. Even the PP9 battery is included for you £16!
Below: Switch fitted. This has two 2mm Dia nuts and bolts (again supplied) and I used some masking tape wound round a slither of wood to hold the nuts as my fincers are more useful with 1" Whitworth.
More to follow in next post.
Mick