Common rail wiring
A wiring system wherein one rail is electrically continuous. A single wire connected to it serves as a common return for two or more cabs.
Configuration variable (CV) ...
two separate power sources (controllers) are connected to the track with one rail in common and the other switched between the two sources. Saves on wire and also means you can use SPDT switches and not DPDT switches. Known as common rail wiring in ...
 See also: Track, Throttle, Truck, Layout, DCC
  
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