Four-wheel passenger car truck

In a railway vehicle truck, a pair of axles spaced apart longitudinally of the truck from each other and each mounting a gauged pair of flanged railway wheels, a truck frame comprising a pair of transversely spaced longitudinally extending side members each having end portions positioned above the axles and resiliently supported thereon transversely inboard of said wheels and a central portion depressed to a lower level than said end portions and a pair of longitudinally spaced transversely extending transom members rigidly connected to said side members adjacent the depressed center portion thereof and being formed with upward and outward extensions projecting above said side members and outwardly therefrom a substantially greater distance than the outer surfaces of said wheels, the outer extremities of said extensions being formed as clevises, depending transversely swingable hangers pivotally mounted in said clevices, said side members being formed with a longitudinally elongated aperture in their depressed portions, a transversely extending spring plank passing through said apertures and being supported near its ends from said swing hangers, upright spring devices supported on the ends of said spring plank, a transversely extending bolster carried at its ends on said upright spring devices and extending over the depressed center portion of said side members, and means preventing substantial movements of said bolster longitudinally of the truck with respect to said truck frame while accommodating lateral and vertical movements therebetween as permitted by said swing hangers and upright spring devices, and means connecting said bolster and said spring plank to each other to prevent substantial transverse movements therebetween while accommodating vertical movements permitted by said upright spring devices.