Abstract: A track shoe for a crawler track has a hollow body with top and bottom sections and perimeter side walls defining a void therebetween. A supporting pillar is located in the void and extends between the top and bottom sections. The pillar is located in the main loadbearing region of the shoe and bears most of the load on the shoe. This enables the thickness of the side walls to be minimized. The shoe can be manufactured more efficiently by complementing foundry methods.

Abstract: A railway wagon suspension system which includes an axle assembly comprised of two wheelsets supporting springs for the wagon and interconnected by linkages at each of their ends via a respective bellcrank both of which bellcranks are pivoted to the wagon, confronting arms of the two bellcranks being pivotally interconnected by a link, and the linkages from each end of the two wheelsets being pivotally connected to the other arm of a respective one of the bellcranks with the linkages from one wheelset being closer to the end of that arm than the linkages from the other wheelset.