conduit system

from The Collaborative International Dictionary of English v.0.48
Conduit system \Con"duit sys"tem\ (Elec.)
   A system of electric traction, esp. for light railways, in
   which the actuating current passes along a wire or rail laid
   in an underground conduit, from which the current is "picked
   up" by a plow or other device fixed to the car or electric
   locomotive. Hence
    

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