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Hi Joe, The thunderous silence about this topic implies that I hit upon an unkown subject. The pony truck helps guide the engine around curves be lifting the frame front rail. In many cases this lifting is progressive; providing more lift as the curvature increases. All locomotives with more than four drivers require some lateral motion or they will not stay on the track. Locomotives with long wheel bases need help to be less stiff. Lateral motion devices are located on a chosen driver axle betwee the driver boxes. They allow more movement in a curve while keeping all axles in tram. As the locomotive exits the curve the lateral motion device returns the axle and drivers to their centered position. Sincerely, John
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