post edited post feedback from sai jinendra** sir
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case I - ticket FROM nagpur TO new delhi,
BOARDING POINT nagpur RESVN UPTO agra.
if u board your onward train(the 2nd train or the connecting...
more... train) within 24 hrs of arrival of ur 1st train- u need not pay a single rupee to the next tte on board. i rpt, u r eligible to continue your journey on any avlbl berth in the specified class.
if u board the next day, u need to pay fresh resvn charges of rs.20/30 depending on the class...