helper grade

名词 n.
中文释义

英文释义

名词 n.
  1. A railroad gradient where helper locomotives are required to assist the train locomotives. US
    — On February 5-6, 1960, this westbound train made its run in 25 hr. 40 min. despite falling temperatures, fog, rain, sleet and snow; a 1 in 54 helper grade to the summit of the Alleghenies; and a load of 55 cars carrying 100 trailers for a gross tonnage of 3,856 tons.

词形变化

helper grades plural
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