This is what I use. Its a type of thermistor called a current inrush limiter. Unlike diodes and resistors its a dynamic device that limits the startup current but not the top speed of the engine. Use one in series with each motor. The CL-150 linked above will work with the Mabuchi RS385 single motors used in virtually all current Williams products as well as Lionel Traditional engines. Use two CL 160's in dual motored engines
I might not be able to crawl at 1 MPH like a DCS engine but in slow race it would be pretty close.
Typical installation:
Pete
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