A door lock for at least one door panel mounted on a door operator attached to a transit vehicle. Such door operator includes a door drive. The door lock having a lock shaft mounted on the operator of such door panel. The lock shaft is oriented in a direction disposed substantially parallel to an opening direction and a closing direction of such at least one door panel. At least one primary lock device connected to such lock shaft, the primary lock device engageable with such door drive for preventing motion thereof. At least one secondary lock device connected to such lock shaft. The secondary lock device engageable with at least one of such door panel and a hanger for such door panel for preventing movement thereof. At least one lock cam mounted on the hanger for engaging such lock shaft for rotating the lock shaft from an unlocking position to a locking position when such at least one door panel is moved in such door closing direction to a closed position of such at least one door panel. An unlocking actuator is attachable to such door operator. The unlocking actuator having a moveable portion connected to the lock shaft to rotate lock shaft to such unlocking position for unlocking such at least one door panel.