Thought you would like to see my latest car (trailing) for the battery and BPS electronics board. The decoder/wireless/speaker are in the Climax but I need a car for the battery etc.
You will note the two pipes (lower left with the chain over the pipes) – these are for power to the loco – there are two small plugs on the loco on the same side, so thin wires will do the connection.
Also, on the top rear of the tank are two small pipes – one higher than the other – these are the recharge points. Just plug in the power supply and the recharge will start. The tank is not firmly secured on the flat car just sort of held in position with the chains. The barrels etc are glued down. The chain (not glued) at the back is part of the chain keeping the tank in position.
I have two magnetic reed switches (the ones you supplied) glued up at the top inside both ends of the tank. So I just wipe with the magnetic wand for start and stop.
In the background is another battery car – the tank.