Abstract: A re-railing jack for returning derailed track vehicles to the track includes a threaded jack screw pivotally mounted in a ground supported swivel base. A jack housing is longitudinally movable on the jack screw in response to rotation of the jack screw by a ratchet which engages the jack screw. The jack housing includes a first portion threadedly engaged to the jack screw and a second integral portion positioned in the coupler pocket which normally receives the automatic coupler of the track vehicle. The housing second portion is retained in the coupler pocket by the same pin which holds the coupler in place. The pin extends through transverse slots of the jack housing permitting the housing to pivot within the coupler pocket about the point of connection of the housing to the vehicle. The jack is thus safely connected to the vehicle in an efficient manner which facilitates lifting and combined downward lateral movement of the vehicle back on to the track.