Language: English. Full Description Corrosion is a well-known electrochemical process that may be caused by the pickup and subsequent discharge into the earth of stray direct current DC from an underground metallic structure. Underground metallic structures can become part of the earth return for a DC rail transit system when the earth acts as a parallel path to the rails; the metallic structures are then subject to corrosion. The first electric railways in the U.
Very early in the development of these systems, the running rails were used as conductors for returning traction current to the power source. Because most of these systems were street railways or trolleys, the areas in which the railways were built were also the areas most likely to have underground metallic structures, especially piping. It is reported that corrosion of underground metallic structures was attributed to streetcar return currents as early as Around , corrosion of underground metallic structures from all causes was the topic of much research.
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