Flange Climb Derailment Criteria and Wheel/Rail Profile Management and Maintenance Guidelines for Transit Operations (2005) / Chapter Skim
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Transit systems are usually operated in dense urban areas, which frequently results in lines that contain a large percentage of curves or curves with small radii, which can increase wheel and rail wear and increase the potential for flange climb derailments. Transit systems also operate a wide range of vehicle types -- such as those used in commuter rail service, heavy or rapid transit, and light rail vehicles -- with a wide range of suspension designs and performance characteristics.
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From page 4... ...
Application of lubrication is very limited in transit due to the complications related to wheel slide and wheel flats. • Reduction of wheel/rail wear can be achieved by optimization of wheel/rail profiles, properly designed truck primary suspension, improvement of track maintenance, and application of lubrication.
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From page 5... ...
• Besides the flange contact angle, flange length also plays an important role in preventing derailment. The climb distance can be increased through use of higher wheel maximum flange angles and longer flange length.
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