Railway tank car

Claim 1

A RAILWAY TANK CAR COMPRISING A GENERALLY CYLINDRIC-LIKE BODY SHELL, A BOLSTER STRUCTURE ADJACENT EACH END OF THE BODY SHELL HAVING A CRADLE SECURED TO THE BODY SHELL, A SEPARATE STUB CENTER SILL STRUCTURE ADJACENT EACH END OF THE CAR EXTENDING INWARDLY BEYOND THE BOLSTER STRUCTURE AND COMPRISING A PAIR OF SPACED VERTICAL WEBS HAVING LOWER FLANGES, A COUPLER AND DRAFT GEAR STRUCTURE CARRIED BY EACH STUB CENTER SILL STRUCTURE, A SADDLE PLATE SECURED BETWEEN EACH STUB CENTER SILL STRUCTURE AND THE BODY SHELL EXTENDING INWARDLY BEYOND THE ADJACENT CENTER SILL STRUCTURE, SAID SADDLE PLATE BEING GENERALLY ARCUATE AND CONFORMING TO THE OUTER ADJACENT SURFACE OF THE BODY SHELL, AND AN EXTERNAL RING-SHAPED MOMENT DISSIPATING STRUCTURE CONNECTED DIRECTLY TO THE INNER END OF EACH STUB CENTER SILL STRUCTURE AND SECURED ABOUT THE ENTIRE OUTER PERIPHERY OF THE BODY SHELL, SAID RING-SHAPED MOMENT DISSIPATING STRUCTURE COMPRISING AN ANNULAR RIB EXTENDING IN A VERTICAL PLANE ABOUT THE BODY SHELL AND AN ANNULAR FLANGE SECURED TO THE RIB GENERALLY AT RIGHT ANGLES THERETO IN OUTWARDLY SPACED GENERALLY CONCENTRIC RELATION TO THE BODY SHELL WHEREBY MOMENT TRANSMITTED FROM THE COUPLER AND DRAFT STRUCTURE TO THE CENTER SILL STRUCTURE AND SADDLE PLATE IS DISSIPATED ABOUT THE PERIPHERY OF THE TANK SHELL BY THE MOMENT DISSIPATING STRUCTURE THEREBY PERMITTING A RELATIVELY SHORT LENGTH SADDLE PLATE AND CENTER SILL STRUCTURE.