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在北美铁路协会机务标准手册有关制动的E分册中,涉及单级货车制动机性能的标准有两项:S-469-47《货车制动机性能规范》和S-461-76《单级货车制动机性能规范》。前者是1933年采用、1947年修订的,取代1895年采用、1911年最后一次修订的《货车三通阀试验要求》,是与“AB”控制阀的采用相一致的。后者于1962年为适用于“ABD”控制阀而采用的,1978年为适用于“ABDW”控制阀进行了修订。现将采用“ABDW”控制阀的货车制动机的性能规范S-461-76附后,供读者参考。
There are two criteria involved in the performance of single-stage truck brakes in the North American Railroad Association Manual of Standards for Lifting Operations: E-Brake, S-469-47 Performance Specification for Truck Brakes and S-461-76 Single Class truck brake performance specifications. “ The former is adopted in 1933, revised in 1947, replacing 1895, the last revision of 1911, ”truck three-way valve test requirements“, is consistent with the ”AB“ control valve. The latter was adopted in 1962 for ”ABD“ control valves and in 1978 was revised for ”ABDW“ control valves. Now use the ”ABDW" control valve truck brake performance specifications S-461-76 attached for the reader’s reference.