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The cut-out pressure should be in accordance with the pressure setting of the piece number being used. (Common cut-out pressures are between 105-125 psi.) With the engine still running, make a series of brake applications to reduce the air pressure and observe at what pressure the governor cuts-in the compressor.
The train brakes are released by admitting air to the train pipe through the engineer's brake valve. A fully charged brake pipe is typically 70â90 psi (4.8â6.2 bar; 480â620 kPa) for freight trains and 110 psi (7.6 bar; 760 kPa) for passenger trains.