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Its a system for powering trolley cars. Since the power demand of traction cars is low compared to locomotives pulling trains it is possible to run traction cars on half-wave control.  

 

If there are three conductors, the two running rails plus a common overhead, two independent two-controller half-wave systems can be installed giving independent control over four cars.  That is what is meant by the "Detroit System."

 

Reference: Model Traction Handbook by Paul Mallery & Steven Mallery (1974).

 

Has this been done with 3 rail instead of overhead?

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