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150 per cent air brake equipment Altoona auxiliary reservoir average bearing area brake cylinder pressure brake pipe pressure brake pipe reduction brake shoe braking force clasp brake conditions coefficient of friction curves diagram difference effect electro-pneumatic equipment emergency application emergency braking power emergency stops feet flanged shoes full service application graduated release high braking power length of stop lever locomotive mean coefficient miles per hour nominal braking power o o o o o obtained operation Pennsylvania Railroad Company percentage of braking piston travel PM equipment PM PM PM reduced rigging efficiency road tests service brake application shoe bearing shoe condition shoe pressure shown in Fig shows slack action standard brake stopping distance surface temperature train stop triple valve truck TV1Ol types of brake UC equipment UC pneumatic equipment universal valve wear wheel sliding