MLW RSC-13's 1721, 1717, 1710 are westbound at Aldershot East. These unique 1000hp locos were built with 6-wheel trucks for light rail and later converted to 4-wheel. For some reason, around <PERSON>, we called these locos ``Tractors.'' The 1700's were all gone by the mid 70's but were a common site hauling freight on the Grimsby Sub.