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[quote user="Paul_D_North_Jr"] What is the maximum allowable leakage rate (X decrease in psi in Y minutes, etc.) in the trainline ? If the trainline did leak at such a rate, how long would it be until the air brakes 'bleed off' and are released ? [/quote] Paul, The leakage that Jerry refers to is not from the trainline in the normal sense of leakage from a pressurized trainline.  It is leakage from the pressurized brake cylinder and connected reservoir on each car individually with some cars leaking down faster than others.  I have never understood where this leakage escapes to atmosphere.  Is it through the cylinder past the piston, or through the valve?  If it is through the valve, does it exit the valve through the exhaust vent, through the bleed valve, through the open trainline, or a combination of those routes?  Maybe somebody could explain this.
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