TRIPLE VALVES 



227 



difference in holding power of the two types of brakes. The 

 engines with the high-speed equipment, curve 1, passed the 

 point at which the cars stopped, curve 2, at a speed of about 

 53 mi. per hr, and with a wrecking energy of 110,000 ft.-lb. 

 per 1,000 Ib. of engines. The engines with the LN equipment, 

 curve 4, passed the point at which the cars stopped, curve 5, 

 at a speed of about 55 mi. per hr., and with a wrecking energy 

 of 108,000 ft.-lb. per 1,000 Ib. of engines. This shows clearly 



that the efficiency of the car brakes is much greater than that 

 of the locomotive brake, due to the unbraked weight of the 

 locomotive and to its relatively low per cent, of braking power. 

 The train with the high-speed equipment, curve 3, passed the 

 point at which the train with the LN equipment stopped, 

 curve 6, at a speed of about 36.5 mi. per hr. and a wrecking 

 energy of about 48,000 ft.-lb. per 1,000 Ib. of train. 



The comparative retardation curves for an eight-car train > 

 when service applications are made, are shown in Fig. 7,. 



