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Radial steering truck

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A Radial steering truck is a type of locomtive bogie truck, which are the supporting wheel assemblies under railway rollingstock. Bogie trucks are found on almost all rollingstock, excepting historic steam locomotives (e.g. a 0-6-0) and 2axle wagons. On diesel and electric locomotives the trucks are powered, typically with electric traction motors mounted within the bogie truck, using motor pinion and axle bull gears of various ratios to rotate the driving wheels.

Diesel and electric locomotive bogie trucks have 2 axles or 3 axles, and rarely 4 axles; more axles cause more difficulties negotiating curves. To solve this problem, in 1993 the EMD#HTCR radial steering bogie truck was introduced with their EMD#SD70 model series, which allows the wheelsets to steer within the assembly though curves, and thus reducing wear at the wheel flange to rail interface; increased adhesion is also claimed. The HTCR has had mixed results in operation and maintenance, and in 2003 EMD introduced the HTSC bogie truck, which is basicly the HTCR with steering components removed.

See also

  • http://emdiesels.com/lms/emdweb/products/radial_truck.jsp
  • "EMD HTCR Truck Specifications" (PDF). EMD and Progress Rail.
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