通常线路平、纵断面设计完成后,由行车人员据此化简加算坡度,进行列车牵引计算,计算行车时分、耗水量、耗煤量(内燃为耗油量、电化为耗电量)和区间通过能力。这一程序在长大下坡地段,在同一动力牵引条件下,坡段组成往往因蒸汽机车仅具备空气制动,而导致施行周期制动的参数不能与列车牵引工况相协调, Usually line level, longitudinal section design is completed, by the driver to simplify the addition of slope, train traction calculation, calculation of driving hours, water consumption, coal consumption (internal combustion for fuel consumption, electricity consumption) and interval Through capacity. This procedure grows downhill lots, under the same power traction conditions, the composition of the slope is often due to the steam locomotive only with air brake, which led to the implementation of the parameters of the periodic braking can not be coordinated with the train traction conditions,