Abstract: A railway house car plug door includes mechanism for moving the door transversely of the car side wall out of and into closed position and for ensuring that the door locking bars are retracted during such transverse movements, and are in locking position when the door is fully closed and comprises a vertically elongated plate mounted for rack and pinion actuated vertically slidable movement in guides on the door. At its upper end the plate is notched at both sides and provided with protruding ears engageable with rolls on bellcranks to actuate the top locking bars, these bellcranks being connected by vertical links to bellcranks controlling the bottom locking bars.