Contact Shoe
Electric railways with third rails in tunnels carry collector shoes projecting laterally (sideways) from their bogies. The contact shoe may slide on top of the third rail (top running), on the bottom (bottom running) or on the side (side running). The side running contact shoe is used on rubber tired metros. A vertical contact shoe is used on ground-level power supply systems, stud contact systems and fourth rail systems. A pair of contact shoes was used on underground current collection systems.
Read more about this topic: Current Collector
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