I think u are cheated. atleast one person from ticket should report and request about remaining people that they board from a later station. I have seen many people doing so. Now problem is even if u inform here at SC that TTE will deboard somewhere in the middle station
but sir what is alternative for people who booked ticket first but later some passengers want to board at a later stage. because partial change of boarding is not allowed. But anyways as u said there is no rule about this. But I think this could be legal(im not sure) if they inform chief reservation supervisor and take permission.
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