Power
Early rotaries had steam engines inside their carbodies to power the blades; a few are still in working order, and in particular one on the White Pass & Yukon Route in Alaska performs annual demonstration runs through thick snow for the benefit of photographers and enthusiasts. Newer constructed rotaries are either diesel or electric powered; in the latter case, an electric supply is required. Many steam plows were converted. Some electric plows can take their power from a locomotive, while others are semi-permanently coupled to power units, generally old locomotives with their traction motors removed; these are colloquially called "snails." (This is derived from the fact that engineless but motored units that take their power from another locomotive are "slugs" - thus the opposite, with engine but no motors, is a "snail.")
Read more about this topic: Rotary Snowplow
Famous quotes containing the word power:
“Quintilian [educational writer in Rome about A.D. 100] hoped that teachers would be sensitive to individual differences of temperament and ability. . . . Beating, he thought, was usually unnecessary. A teacher who had made the effort to understand his pupil’s individual needs and character could probably dispense with it: “I will content myself with saying that children are helpless and easily victimized, and that therefore no one should be given unlimited power over them.””
—C. John Sommerville (20th century)
“In the intellectual order, the virtue of humility is nothing more nor less than the power of attention.”
—Simone Weil (1909–1943)
“But it is impossible that the creative power should exclude itself. Into every intelligence there is a door which is never closed, through which the creator passes.”
—Ralph Waldo Emerson (1803–1882)