Third rail shoe

Publish Date :July 18, 2016
Summary :

The easy way to avoid severe damage of the third rail shoe
Most tunnel or metro trains get their electrical power from a so-called third rail contact shoe coated with a graphite slip for wear surface. Continued use will wear out the graphite slip, and the shoes are usually inspected manually at the workshop in connection with periodic inspections. The problem is, however, that manual inspection carried out periodically will not detect the wear and damages that inevitably occur between the scheduled inspections.
Damages on the third rail contact shoe often occur because of track irregularities that cause the graphite slip to skip in stead of sliding over the track. The carbon-arc that occurs in this process will damage the graphite slip surface, and repeated use may result in severe damage of the third rail contact shoe if the shoe welds itself firmly into the third rail.