Patent ID: 8136457

Claim:
A side bearing for use in a railroad car truck, comprising: a cage comprising a generally horizontal bottom surface and an upturned sidewall extending from the bottom surface to a top land, the upturned sidewall including two opposing lateral sides and two opposing ends with adjacent sides and ends being joined by corners, the upturned sidewall further including an inwardly facing wear-limiting contour and defining an interior of the cage; a resilient element at least partially received within the interior of the cage; and a cap engaging an upper end of the resilient element, the cap including a generally horizontal top surface having a perimeter and a downturned sidewall disposed around the perimeter of the top surface, the downturned sidewall of the cap including an outwardly facing wear-limiting contour interrupted by at least one outwardly facing raised pad and being adapted to be at least partially received within the interior of the cage directly adjacent to the upturned sidewall of the cage, the wear-limiting contour being arranged to produce a gap between the upturned sidewall and the downturned sidewall in the corners.