4Robles H F C, Plascencia G, Koch K. Rail base corro- sion problem for North American transit systems [ J ]. Engineering Failure Analysis, 2009 (16) :281 -294.
5Cottml 1, Charalambous A C, Ernst P, et al. Stray current control in DC mass transit systems [ J ]. IEEE Trans. Veh. Technol. , 2005,54(2) :722 -730.