228 



TRIPLE VALVES 



The old, or high-speed, equipment train had a brake-pipe 

 pressure of 110 Ib. and the new, or LN, equipment train, a 

 brake-pipe pressure of 90 Ib. The old-equipment train was 



/000 

 D/sfance frtfeefy 



FIG. 7 



stopped with two applications as will be seen by the cylinder- 

 pressure diagrams; with the new equipment, the brake was 

 first applied heavily and graduated off as the end of the stop 

 was approached. 



The comparative retardation curves for an eight-car train, 

 when emergency applications are made, are shown in Fig. 8. 



FIG. 8 



The brake-pipe pressure was 90 Ib. and the total weight of the 

 train was 532.5 T. The curves show that when the train 

 equipped with the old, or high-speed, equipment passed the 



