The paper deals with certain fundamental aspects of wagon design and performance. Torsional rigidity of four-wheel and bogie wagons, forces imposed by the track on the running gear, and the stresses imposed by the vehicles on the track are considered, with particular reference to the establishment of an economically justifiable common goal based on all-round optimum performance. Bogie rotational resistance, lozenging forces, friction, and hydraulic damper performance requirements are briefly dealt with before particulars of the performance of modern four-wheel and bogie wagons are provided. The paper concludes with a brief reference to future trends regarding wagon design.
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