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2005 Track circuit calculations - PJW - 05-07-2010 As per Indian Practice: (1) With optimum feed voltage and maximum ballast resistance of the track, its relay voltage:- (a) When the minimum permissible shunt resistance is connected across, shall not be more than 85% of its drop away value; (b) Without a shunt across, shall not be more than 250% of its pick up value, and (2) With normal feed source voltage and minimum permissible ballast resistance of the track, its relay voltage shall not be less than 125% of its pick up value. Above values are matching with uk practice? Please clarify ======================================================================= See attachments for an attempt and the feedback on that. RE: 2005 Track circuit calculations - dorothy.pipet - 30-11-2015 FYI