Technical Reports

High Cant Deficiency Test of the F40PH Locomotive and the Prototype Banking Amcoach

  • 01
  • Jan
  • 1983
AUTHOR: P. L. Boyd and W. L. Jordan
SUBJECT: Facilities & Test Equipment, Passenger Rail
KEYWORDS: Curving Safety
ABSTRACT: Increasing the speed of passenger trains in existing curves has been proposed as an alternative to changing curve radii for the purpose of reducing trip times on the Northeast Corridor. Tests were performed on the F40PH diesel-electric locomotive and an Amcoach modified for banking, with and without the banking system in operation. Safety at high cant deficiency was evaluated by comparing direct wheel/rail force measurements to safety criteria from world-wide sources. Cant deficiency limits for these and other lightweight four-axle passenger vehicles (tested previously) were set by concern for vehicle overturning (wheel lift) rather than wheel climb or catastrophic track damage. An allowance for safety in high cross wind operation caused the coach to be the limiting factor. A typical curve limited to 60 mph by the current 3 inch cant deficiency limit could be negotiated by a train consisting of F40PH locomotives and banking Amcoachs at up to 76 mph (8 inch cant deficiency) while satisfying ride comfort and safety criteria. A few rough curves were identified as exceptions to the general rule.