Rigatoni Express Railroad posted:... Are the three wires (White, yellow, Red) already in the car?
Not the physical wire itself - you have to supply 3 wires of several inches each and of course they don't have to be the color indicated. I chose those colors to match the terminals where they attach to...which just happened to be solderable terminals (2 on the DC gearmotor, 1 on the microswitch) so you don't have to solder the wires directly to the MTH electronic circuit board.
gunrunnerjohn posted:The only problem I see with the bell circuit is you also get the bell on the locomotive.
Right. I figure this was back-in-the-day when getting a horn sound was a "luxury" option. So I figure the horn was more popular than the bell so the bell detector would be a logical choice? Of course in most cases when driving a local DC load, you simply reverse the 2 wires of the offset detector and a horn-detector becomes a bell-detector. 
