Railway car

Claim 1

A RAILWAY CAR HAVING A FRAME EXTENDING LENGTHWISE OF THE CAR AND A LOAD CARRYING STRUCTURE MOUNTED ON THE FRAME BY A PLURALITY OF MOUNTINGS IN LOAD CARRYING RELATION BETWEEN THE FRAME AND THE STRUCTURE, SAID MOUNTINGS HAVING A NATURAL FREQUENCY IN THE VERTICAL DIRECTION ABOVE THE RANGE OF THE TRACK FREQUENCIES 2 TO 7 CYCLES PER SECOND AND HAVING A NATURAL FREQUENCY IN THE FORE AND AFT DIRECTION BELOW 7 CYCLES PER SECOND, SAID MOUNTINGS COMPRISING SPACED HORIZONTAL PLATES EXTENDING LENGTHWISE OF THE CAR FRAME AND ARRANGED ONE ABOVE THE OTHER WITH THE UPPER PLATE CONNECTED TO THE LOAD CARRYING STRUCTURE AND THE LOWER PLATE CONNECTTED TO THE FRAME AND WITH A BODY OF ELASTOMER SANDWICHED BETWEEN AND UNITED TO THE UPPER AND LOWER PLATES, THE TOTAL THICKNESS OF THE ELASTOMER BEING AT LEAST SUBSTANTIALLY THREE INCHES AND THE SPRING RATE OF THE ELASTOMER BEING SUCH THAT THE MOUNTING DEFLECTS LENTHWISE AT LEAST SUBSTANTIALLY EIGHT INCHES UNDER THE MAXIMUM IMPACT ARISING DURING SWITCHING OR HUMPING, A PLURALITY OF HORIZONTAL PLATES SPACED FROM EACH OTHER AND DISPOSED BETWEEN THE TOP AND BOTTOM PLATES AND EMBEDDED IN AND BONDED TO SAID ELASTOMER, THE SPRING RATE OF THE MOUNTINGS IN THE VERTICAL DIRECTION BEING AT LEAST TEN TIMES THE SPRING RATE OF THE MOUNTINGS IN A LONGITUDINAL DIRECTION, THE LENGTH OF THE UPPER AND LOWER PLATES EXCEEDING BY A SUBSTANTIAL AMOUNT THE MAXIMUM LENGTHWISE DEFLECTION UNDER IMPACTS ARISING DURING SWITCHING OR HUMPING SO THAT THE PLATES ARE ALWAYS IN AT LEAST PARTIAL OVERLAPPING RELATION AND THE BODY OF RUBBER BETWEEN THE UPPER AND LOWER PLATES PROVIDES A STABLE SUPPORT FOR THE STRUCTURE.