A RAILWAY CAR HAVING AN OPEN-ENDED SILL THROUGH WHICH BUFF AND DRAFT FORCES ARE TRANSMITTED TO THE CAR AND INCLUDING A BUFF-AND FORCE-CUSHIONING UNIT WHICH IS CAPABLE OF BEING INSTALLED AND REMOVED FROM THE END OF THE SILL. T HE SILL INCLUDES A CONNECTOR STRUCTURE WHICH RETAINS A PAIR OF REMOVABLE DRAFT LUGS IN POSITION FOR DRAFT CONTACT WITH DRAFT STOP SHOULDERS FORMED ON THE CUSHIONING UNIT. THE REMOVABLE DRAFT LUGS

COOPERATE WITH THE DRAFT STOP SHOULDERS TO ACHIEVE POSITIVE CENTERING OF THE CUSHIONING UNIT WITHIN THE SILL AND ALSO TO SERVE AS RETAINING MEANS FOR A COUPLER KEY ESTABLISHING CONNECTION BETWEEN THE CUSHIONING UNIT AND A RAILWAY CAR COUPLER.