Citation

Railw. Gaz. 1939; 71: 171-174.

Copyright

(Copyright © 1939, DVV Media)

DOI

unavailable

PMID

unavailable

Abstract

A series of tests were conducted to determine the drawbar horsepower required to haul a 1,000-ton train at a constant speed of 100 mph on straight level track. A 16-car test train, including dynamometer car, was assembled, equipped throughout with four-wheel trucks and conventional friction bearings. The test comprised a trip from Fort Wayne, Indiana, to Grand Island, Nebraska, and back, and six locomotives in all were employed of three types. Measurements were made on constant grades at least 6300 ft. long. The resistance in pounds per ton are shown over the test stretches for each locomotive type. During the test the maximum drawbar horsepower developed by each locomotive was also recorded and was used to determine the adjusted horsepower delivered to the drawbar for the locomotive running at constant speed on straight level track. The test results and the Davis formula were used to calculate horsepower curves for a 1000-ton train traveling various speeds.