Central Railway suspects reverse electric current caused the October 26 signalling failure at Kanjurmarg, disrupting Mumbai suburban trains across Main and Harbour lines. Blank signals between Vikhroli and Bhandup forced cancellations, delays and alternative train operations. Mumbai: A suspected reverse flow of electric current may have triggered the failure of signalling and telecommunication (S&T) equipment at Kanjurmarg, disrupting Central Railway's suburban services for much of October 26.