TTCI has inspected four trucks and analyzed maintenance data from 300 cars after approximately 1 million miles in western coal service. Investigations show the trucks to be in remarkably good condition with few component removals to date and almost no WILD wheel removals. Wedge wear after 1 million miles has increased the wedge rise to 0.68 inch. The loaded hunting stability was found to be 50 mph in the worn condition. Intermittent wheel wear may suggest truck rotation problems associated with damage to center plate liners and high contact stresses related to the chamfer on the center plate. Solutions to these issues are being investigated by TTCI in 2018.