Air Brakes and Train Handling Rules - Alaska Railroad

67.17 Train Brake Releases67 Car Equipment and ComponentsTrain brake release times depend on:• Train length• Brake pipe leakage• Amount of brake pipe reduction being restored• Type of air brake equipment (AB, ABD, or ABDW)67.17.1 Time Chart For Starting Release On Last CarUse Table 67-N to determine the time required to begin the release ofa 10 psi brake pipe reduction if:• Initial brake system pressure is 90 psi.• Minimum brake pipe leakage is present.• Train is equipped with ABD or ABDW control valves.Train LengthTime Required To Start theRelease On Last Car2,500 feet 4.5 seconds5,000 feet 8.4 seconds7,500 feet 13.5 secondsTable 67-N. Time Chart For Starting Release On Last Car.June 1, 1996 ARRC Air Brakes and Train Handling Manual 67-31