Train doors at rear DT carwere not proven closed. TC recycled train doors a few times but to no avai l.DIRBS was operated for train to proceed in ATPM mode bac k to CHD. ~~~~~ Checked and found Door Locking device fixing screws loose. Tightened screws. Cyclic test x 10 - ok. For precaution, sample checked two doors for every car. N.AHENDRA/08.12.21 ---------------