Train door at Rear DT car not proven closed. TC reported obstacle detected. Staff(BSH) needed to pus h close A1 door for train to depart. ~~~~~ 3664 Train door not proven closed. TC reported obstacle detected. Staff(BSH) needed to push close A1 door for train to depart. IMDC:3664 A1 door isolated.  3664 ER checked & found no door fault registered. No FOD was found. Before cleaning of J-rail, RHS = 8.2KN, LHS = 7.8KN. After cleaning of J-rail, RHS = 4.8KN, LHS = 5.2KN. Function check door operation & door cyclic operation check - OK Door open/close timing checked within criteria.  Sarma 44222