. Electric railway journal . nable because with it slight shoewear produces a great variation in piston travel. Thereason for this is explained below. over, in traction service the amount of air consumedper car would be excessive if the piston travel were longand the leverage low (a high leverage permitting theuse of a small brake cylinder for a car of given weight)as brake applications are usually very frequent in suchservice. For these reasons it is customary to adhere asclosely as possible to the piston-travel standards whichhave been fixed by the best practice, and which must becarefully m
. Electric railway journal . nable because with it slight shoewear produces a great variation in piston travel. Thereason for this is explained below. over, in traction service the amount of air consumedper car would be excessive if the piston travel were longand the leverage low (a high leverage permitting theuse of a small brake cylinder for a car of given weight)as brake applications are usually very frequent in suchservice. For these reasons it is customary to adhere asclosely as possible to the piston-travel standards whichhave been fixed by the best practice, and which must becarefully maintained in service in order to secure satis-factory results. It is important to note in this connec-tion that the standard piston travel should always bethe average of the maximum and minimum valuesactually obtained. A further reason for adhering to established stand-ards of piston travel and braking power is that it ismost essential to provide for clearance between thebrake shoes and the wheels when the brake is
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