. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . as far as brakes are concerned, is de-veloped under all conditions of load. Inordinary traction service, it is seldomnecessary to approach within a wide mar-gin of this capacity. But, in large cities,on the other hand, to secure adequate re-turns on lines costing hundreds of thous-ands of dollars per mile, to relieve trafficcongestion and to meet the public de-mands for rapid transit and frequency ofservice, the maximum carrying capacityof the track must sometimes be is the fiel
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . as far as brakes are concerned, is de-veloped under all conditions of load. Inordinary traction service, it is seldomnecessary to approach within a wide mar-gin of this capacity. But, in large cities,on the other hand, to secure adequate re-turns on lines costing hundreds of thous-ands of dollars per mile, to relieve trafficcongestion and to meet the public de-mands for rapid transit and frequency ofservice, the maximum carrying capacityof the track must sometimes be is the field of the Variable LoadBrake. The feature of preventing an appreciablevariation in stopping distance is obtainedwith the Variable Load Brake by in-creasing, as the car load increases, thebrake shoe pressure secured per poundbrake pipe reduction; e. g., if, on an empty FIG. 1. doors closed, as is the case with the carin motion, the mechanism is locked, sothat any change in position of the carbody, due to the cars motion, will notproduce a false setting of the variableload or weighing mechanism. The
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