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Claim 1

A RAILWAY CAR SIDEWALL STRUCTURE COMPRISING IN COMBINATION, (A) A PLURALITY OF VERTICAL SIDEWALL POSTS, (B) A TOP SILL CONNECTING SAID SIDEWALL POSTS, (C) A SIDE SILL CONNECTING SAID SIDEWALL POSTS AT THE LOWER ENDS, (D) AN OUTER WINDOW DEAD LIGHT PANEL INTERMEDIATE SAID SILLS AND CONNECTED TO THE OUTER FACE OF ADJACENT VERTICAL SIDEWALL POSTS, SAID PANEL (1) HAVING A FORMED WINDOW APERTURE THEREIN RECESSED AWAY FROM SAID OUTER FACE OF SAID VERTICAL SIDEWALL POSTS, (E) A LOWER BELT RAIL CONNECTED TO SAID DEAD LIGHT PANEL AND TO SAID SIDEWALL POST BELOW SAID FORMED WINDOW APERTURE, (F) AN UPPER BELT RAIL CONNECTED TO SAID DEAD LIGHT PANEL AND TO SAID SIDEWALL POSTS ABOVE SAID FORMED WINDOW APERTURE, (G) A U-SHAPED WINDOW FRAME AROUND SAID APERTURE, HAVING (1) UPPER VERTICAL END CONNECTED TO SAID TOP SILL, AND (2) A BOTTOM HORIZONTAL PORTION CONNECTED TO SAID DEAD LIGHT PANEL, (H) AN UPPER WINDOW VERTICAL STUB POST IN VERTICAL ALIGNMENT WITH SAID APERTURE, HAVING (1) AN UPPER END CONNECTED TO SAID TOP SILL, AND (2) A LOWER END CONNECTED TO SAID UPPER BELT RAIL AND SAID DED LIGHT PANEL, (I) A LOWER WINDOW VERTICAL STUB POST IN VERTICAL ALIGNMENT WITH SAID APERTURE, HAVING (1) A LOWER END CONNECTED TO SAID SIDE SILL, AND (2) AN UPPER END CONNECTED TO SAID DEAD LIGHT PANEL, SAID LOWER BELT RAIL AND SAID U-SHAPED WINDOW FRAME POST, (J) AN UPPER SKIN SHEET HAVING (1) A LOWER EDGE CONNECTED TO SAID DEAD LIGHT PANEL, AND (2) AN UPPER EDGE CONNECTED TO SAID TOP SILL, (3) SAID UPPER SKIN SHEET BEING CONNECTED TO SAID VERTICAL ENDS OF SAID U-SHAPED WINDOW FRAME POST, SAID UPPER STUB POSTS AND SAID VERTICAL SIDEWALL POST, (K) AND A LOWER SKIN SHEET HAVING (1) AN UPPER EDGE CONNECTED TOS AID DEAD LIGHT PANEL (2) A LOWER EDGE CONNECTED TO SAID SIDE SILL, (3) SAID LOWER SKIN SHEET BEING CONNECTED TO SAID LOWER WINDOW VERTICAL STUB POSTS AND SAID VERTICAL SIDEWALL POSTS, (1) SAID DEAD LIGHT PANEL AND SAID BELT RAILS PROVIDING THE INTERMEDIATE HORIZONTAL LONGITUDINAL REINFORCING STRUCTURE BETWEEN SAID TOP SILL AND SAID SIDE SILL, (2) SAID UPPER AND SAID LOWER STUB POSTS COOPERATING WITH SAID U-SHAPED WINDOW FRAME PROVIDING AN INTERMEDIATE REINFORCING STRUCTURE BETWEEN SAID SIDEWALL POSTS ON WHICH SAID UPPER AND LOWER SKIN SHEETS ARE ATTACHED TO PROVIDE A SIMPLIFIED LOW WEIGHT HIGH STRENGTH SIDEWALL PANEL.