| 摘要 |
An improved three-piece truck system for railroad cars provides long travel side bearings for improved stability, a "wide" friction shoe design or equivalent to improve sideframe and bolster squareness, a resilient pedestal pad for improved curving performance and enhanced wear resistance, and a suspension system tuned and optimized fo r rail cars to have a minimum reserve capacity of less than 1.5 to improve motion control a nd ride quality, increase resistance to suspension bottoming, and increase hunting threshold speed. Such a motion control truck system is able to meet recent more stringent American Association of Railroads standards, such as M-976, for railcars having a 286,000 lb. gross rail load rating.
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