Grand Scales General Code of Operating Rules – First Edition – January 1, 2007
brakes, the air brakes must be released. Two long sounds of the whistle should be made to indicate that the brakes have been released. Each car must then be inspected to see that all of the brakes have been released. During the initial terminal airbrake test, the brakes must not be applied or released until the proper signal is given, except in the case of excessive brake pipe leakage. (Both sides of the train need to be inspected for dragging equipment or anything that would cause an un-safe condition including clearance problems.) If the brake pipe gauge indicates leakage in excess of 5 lbs per minute, the engineer must give one short sound and one long sound of the whistle and place the automatic brake valve in the running position to recharge the train. Upon confirmation of this signal, the train must be inspected for air leaks and corrected, then the complete initial terminal air brake test must be repeated.
Check Valve Test 14.8 A “Check valve test” will be performed following the initial terminal test on equipment incorporating this feature.
Check Valve Test Procedure 14.9 Check valve test procedure:
The train air brake system must be charged to within 2 lbs of the locomotive feed valve setting. Next take the brake pipe pressure to zero (Big Hole) and move the automatic brake valve to lap. The brake pipe pressure should not exceed 3 lbs per minute. If the train fails the test, repeat the test by charging the train making sure the train is released. Then take the brake pipe pressure to zero and cut out the automatic brake valve. The brake pipe pressure should not exceed 3 lbs per minute. If the train fails the test, charge the train (automatic brake valve cut in and released) and , starting at the rear of the train, close the angle cock on the rear of the next car forward. Return to the last car and open the rear angle cock putting the car in to emergency. Allow enough time for the pipe to vent (3-5 seconds), and check for air coming from the brake pipe of that car due to leaky check valve (thumb over glad hand). If the car passes, go to the next car forward and close the angle cock on the rear of the next car forward. Return to the second car from the end, separate the hoses, and open the angle cock putting that car into emergency and check for a leaky check valve as above. Repeat these steps until the faulty car is found. Repair the car or remove it from service.
Application and Release 14.10 An application and release test must be performed after the brake pipe has been compromised.
Application and Release Procedure 14.11 Application and release test procedure:
The train air brake system must be charged to within 5 lbs of the locomotive feed valve setting. Upon the proper request or signal to apply the train brakes, a 20 lb brake pipe reduction must be made. It must be determined that the brakes apply on the cars behind the newly added cars. The brakes on the cars must be seen to apply. Upon proper request or signal to release the train brakes, the automatic brake valve must be placed in