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为了保证在北美运营的独立的私营铁路间的协调与合作，在1934年成立了美国铁路协会（AAR）。美国铁路协会过去和现在一直由各铁路的董事长组成的董事会领导。各成员集体出资作为协会的基金，所出份额与它们的总收入成比例。它是一个国际性的组织，它既吸收美国的地吸收加拿大和墨西哥的铁路公司作为其成员。在美国铁路协会中，研究试验部是最大的部。因为该部的研究项目的经济规模常常较大，又由于合作性的研究避免了不应有的重复以及由于该部具有分担研究中的费用和固有风险的能力，所以各铁路公司会从该部所指导的合作研究项目中获得收益。在过去20年中，这个部发展得很快。1971年的年度预算额为70万美元，而现在总预算额已超过了3500万美元，纯预算额在2400万美元左右。这个部拥有的专职工程师、科学家、技术人员和辅助人员已超过300人。
In 1934, the American Railway Association (AAR) was established to ensure coordination and cooperation between independent private railways operating in North America. The American Railroad Association has, for the present and in the past, been headed by a board of directors composed of the chairman of each railroad. Each member contributes collectively as a fund of the association, out of which the shares are proportionate to their total income. It is an international organization that absorbs both the United States and its members as railroad companies in Canada and Mexico. In the American Railway Association, research and testing department is the largest department. Because the Department’s research projects are often of a larger economy and have avoided unnecessary duplication due to collaborative research and because of the Department’s ability to share research costs and inherent risks, The cooperative projects under the guidance of the proceeds. This ministry has developed rapidly in the past two decades. The annual budget for 1971 was $ 700,000, and now the total budget already exceeds $ 35 million and the pure budget is around $ 24 million. The department has more than 300 full-time engineers, scientists, technicians and support staff.