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I beleive most Walthers kits are designed for code 83 rail. The bottom web is the critical point.
To operate 4 or 5 twin-coil machines in parallel from one control button they should be: 1: The same make and have the same electrical characteristics. That way the current should divide equal between the units. 2: Should be the same mechancially i.e. the linkage, thrown rod and etc. must be equal on all units. Any unit that hangs up mechancialy will "steal" most of the current and prevent the others from throwing.
Make sure the trucks are "square". When on the rail do all the wheels set on the rail. If not, a side frame may be twisted. The screws that hold the side frame on the boolsters also provide electrical pick-up for the lights. I had a few with "burrs" in the area of the slot. A small file can touch them up.
Check Walthers website under Tech Resources and you will find the templates for the modular system.
Most AC to DC conversions require replacing the drivers and other wheel sets as they are probably not insulated like on a DC loco.
Does your statement "when I push THE switch button again" mean you are only using one button? If so you need two buttons, one for each direction. Consider a capacitor dischage unit for you power source and you will not burn up the switch motors.
Circuit #1 -- R1 and R2 One selection would be ALPHA 24mm Potentimeters. They come in several mounting options depending on how you plan to mount the parts. They come in chassis mounts and PCB mounts. Cost is under $2. The 555 timer is a DIP chip and would require some kind of circuit board mount. The electrolytic capacitors can be of higher voltage than listed and may be easier to find. The .1 uf can be any voltage highter than 15 volts and usually are rated at least 100 volts. Radio Shack may have
Wild guess. Rerail frogs for returning derailments to the rail. These were usually hung under the walk ways along the side of diesels or under the side of the tender on steam locos.
Better to use a resistor for each lamp. As you have it wired when a lamp burns out the voltage will increase on the other lamps and reduce their life.,
Have you tried TRUCK STOP MODELS? Also look at the web site of 1-87 Vehicle Club.