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为了更好地了解和估价北美铁路制动负荷的综合效果,必须考虑到车辆尺寸、重量、列车编组情况和重量分布等因素的变化及其发展趋势,还要了解这些因素是怎样影响铁路运输工程的。本文是根据对现代货运列车在施行通常的牵引制动操纵以控制列车速度和车辆钩间游间时,制动作用的强度、作用次数和持续时间等所做的调查写成的。对北美十二条主要线路的列车运用情况的调查表明,制动时每车轮的制动功率不大可能使踏面温度超过500～600°F(260～315℃)。如果在施行“牵引制动”或“拉伸制动”
In order to better understand and evaluate the comprehensive effect of the North American railway brake load, we must take into account the changes of vehicle size, weight, train formation and weight distribution and other factors and their development trends, but also understand how these factors affect the railway transport project of. This article is based on a survey of modern freight trains using the usual traction braking controls to control the speed of the train and the inter-vehicle hook, the intensity of the braking effect, the number and duration of braking actions, and so on. A survey of the use of trains on twelve major North American lines shows that it is not likely that the braking power per wheel will exceed 500-600 ° F (260-315 ° C) during braking. If the implementation of “traction brake” or “stretch brake”