Railway car construction

Claim 1

AN OPEN SAID RAILWAY CAR COMPRISING AN UNDERFRAME INCLUDING TWO SIDE SILLS, AN UPSTANDING END PIER FOR EACH END OF EACH SIDE SILL AND RIGIDLY CONNECTED THERETO IN PREPENDICULAR RELATIONSHIP, MEANS INCLUDING A COMPRESSION MEMBER CONNECTING THE UPPER ENDS OF THE TWO END PIERS ASSOCIATED WITH EACH SIDE SILL, A SIDE PLATE OFFSET OUTWARDLY OF EACH COMPRESSION MEMBER, A ROOF SHEET CONNECTED TO SAID SIDE PLATE, A TRANSOM LOCATED BETWEEN THE ENDS OF SAID CAR AND SUPPORTED BY SAID COMPRESSION MEMBERS AND PROVIDING INTERMEDIATE SUPPORT FOR SAID SIDE PLATES, AT LEAST A PORTION OF SAID TRANSOM OVERLYING THE UPPER SURFACE OF SAID COMPRESSION MEMBER WHEREBY SAID ROOF SHEET IS SPACED ABOVE SAID COMPRESSION MEMBER, A REMOVABLE DOOR POST EXTENDING BETWEEN ONE OF SAID SIDE SILLS AND SAID TRANSOM, AND A TWO SECTION DOOR TRACK HAVING ONE SECTION MOUNTED ON SAID DOOR POST AND A SECOND SECTION MOUNTED ON SAID TRANSOM AND ALIGNED WITH SAID FIRST TRACK SECTION TO PROVIDE A CONTINUOUS DOOR TRACK FOR A ROLL UP DOOR, SAID SECOND TRACK SECTION EXTENDING ALONG SAID TRANSOM BETWEEN SAID ROOF SHEET AND SAID COMPRESSION MEMBER, AND BEING CURVED DOWNWARDLY AND EXTENDING BETWEEN SAID SIDE PLATE AND SAID COMPRESSION MEMBER AND ABUTTING THE UPPER END OF SAID FIRST TRACK SECTION.