Technical Reports

Passenger Ride Quality of a Span Bolster Car with Freight Trucks

  • 01
  • Jan
  • 1990
AUTHOR: Rob Martin, Dominic Dibrito
OFFICE: RPD
REPORT NUMBER: DOT/ERA/ORD-90
SUBJECT: Freight Operations
KEYWORDS: Ride Quality, Frieght Trucks, Span Bolster, Vibration Levels, Tank Car/Passenger Car
ABSTRACT: A test was performed to measure the ride quality of an eight axle Span Bolster Rail Car with freight trucks. The Federal Railroad Administration (FRA) and the Association of American Railroads (AAR), felt it necessary to examine the use of freight trucks and Span Bolsters on passsenger cars because, the Peacekeeper Rial Garrison cars, which were to carry people, were designed for the use of Span Bolsters and freight trucks. Vibration levels were measured on a DUPX 29769 Span Bolster Tank Car and the ASFX 1965 Passenger Car. The test was performed while the tank car was in revenue service from Beaumont, Texas, to Charleston, South Carolina, and back over two railroad lines. Vibration levels were compared to ISO specifications for personal ride quality with respect to the fatigue and decreased proficiency limits. It was found that the combination of Span Bolster and freight trucks produced a higher level of vibration than that of a passenger car, which corresponded to a low allowable exposure limit as dictated by the fatigue and decreased proficiency limit. This meant that personnel will fatigue in a usual eight hour shift.

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