United States Department of Transportation
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Abstract:Investigation of derailments have revealed two shortcomings of existing three-piece trucks: poor tracking on curves and hunting on tangent track. Design and installation requirements were developed for an innovative primary suspension radial truck. An initial design incorporated an Ackermann linkage for positive steering of wheelsets. Prototype trucks later modified the simple geometric positive steering system, also used in trucks tested at Calgary Canada by CP Rail, in TDOP and in FAST. A production design was developed using a standard bolster and a pair of special side frames. A conversion kit for existing three-piece trucks has also been developed to give benefits of positive wheelset steering for existing cars at minimum cost. This research has concluded that positively steered radial trucks incorporating primary suspension meet all the requirements for ideal freight car trucks.
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