Designed and built by the Union Pacific Railroad in their Omaha Shop, this rotary snowplow is the biggest and heaviest ever built weighing 367,400 pounds.  Its cutting wheel could throw snow far to either side of the track as it was pushed forward at four to six mph.  It is not self propelled and must be pushed by three or four locomotives.  Number 900081 is powered by a GM/EMD 16 cylinder, 3,000 hp.  turbocharged diesel engine that drives an electric generator which provides power to turn the 12 foot rotary blades at up to 150 rpm.  A steam generator heats the cab, prevents the fuel and water pipes from freezing and can thaw out the cutting wheel if it gets struck.  The plow engineer controls both the plow and the trailing locomotives.  This snowplow is 52 feet 2 inches long, 17 feet high, and was last used in Green River , WY in the mid 1980's.  The circular windows in the front of the plow revolve to keep them clear of snow.  Number 900081 was donated in 1984 by the Union Pacific Railroad.