In all probability, a "dead" zone exists at Mahim Junction (a suburban railway station in Mumbai). It has come to my notice that whenever we travel from King's Circle to Mahim (via the Harbour line, of course), there is a brief period for which the fans go off and the lights come on (even during the day time), but are very dim - a sign that the lights might be powered by some standby.
Unlike the dead zone at Virar, where the dead zone is required for the change in the type of electrification (DC to AC away from Virar), this one seems to be present for a different reason.
Maybe it exists because there is a "handover" spot between King's Circle and Mahim Junction where the Central Railway (which handles the King's Circle part of the line) meets the Western Railway (which handles the Mahim Junction part of the line).
Add one more to the the mysteries of the Indian Railway world.
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