The present disclosure provides an auto-rack bridge plate locking assembly including a support bracket, a support block, a guide tube, a slidable locking pin partially positioned in the guide tube, a handle removably attachable to the locking pin by a removable roll pin, a fixed pivot pin partially positioned in the guide tube, and a spring positioned in the guide tube between the pivot pin and the locking pin. The present disclosure also provides an auto-rack railroad car bridge plate including a plate configured to extend from one auto-rack railroad car to an adjacent auto-rack railroad car, and such locking assembly connected to the plate and configured to pivotally attach the plate to one of the auto-rack rail road cars.