TRAIN AIR-SIGNALING SYSTEM 



401 



A car discharge valve, Fig. 1, is provided on each car. This is 

 usually located outside the car above the door, as shown, and 

 is piped to the train-signal pipe. Sometimes, however, it is 

 placed inside the car above the door, to guard against the valve 

 being clogged in winter. The former position is preferable, 

 however, as the chances of clogging are small, and the annoy- 

 ance caused by the sharp sound of discharging air every time 

 the valve is opened to make signals is avoided. 



FIG. 2 



A signal cord is attached to the lever of the discharge valve, 

 and one end extends across the platform and is fastened in a 

 suitable manner to the hood, while the other end extends through 

 the car and is fastened to the hood on the other end of the car. 

 This cord enables the discharge valve to be operated from any 

 part of the car. 

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