The recommendations contained herein are based upon past successful usage, advances in the state of knowledge, and changes in design and maintenance practices. This chapter is presented as a consensus document by a committee composed of railroad engineers, engineers in private practice, engineers involved in research and teaching, and other industry professionals having substantial and broad-based experience designing, evaluating, and investigating steel structures used by railroads. Part 9 is a commentary, including references, for explanation of various articles in the other parts. Recommendations for the design and construction of special bearings for movable railway bridges are included in Part 6, Movable Bridges. Part 5, Bearing Design and Construction, formulates specific and detailed recommendations for the design and construction of bearings for nonmovable railway bridges. The requirements, however, apply to spans of any length, but special provisions for spans longer than 400 feet should be added by the company as may be required.
Speeds of freight trains up to 80 mph and passenger trains up to 90 mph.Normal North American passenger and freight equipment, and.Part 1 through Part 4, Part 6, and Part 7 formulate specific and detailed recommendations for the design, fabrication, erection, maintenance, inspection, and rating of steel railway bridges for:
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