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[edit] Summary

The London Underground uses a 4-rail system in which the electrical return is isolated from the the running rails (the rails used by the train's wheels). The sparks seen here on a District Line D Stock leaving Ealing Common Station are quite normal and occur when the electric power collection "shoes" of a train that is motoring (i.e. drawing power) reach the end of a section of electric power rail. Photographed by SPSmiler.

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