Rugged Little Beasts
Between 1978 and 1984, Union Pacific rebuilt 75 EMD SW7s, SW9s, and TR5As into a new switcher model, the SW10. The rebuild/upgrade included replacing the original 567 power assembly with a 645 prime mover. Other upgrades were made to the electrical, and cooling systems, control stand, electrical cab heating, refrigerator, and roller bearing trucks.
UP SW9 No. 1848 served as the prototype, and became the first of the 75. By Aug. 1979 it was released from Omaha for service, and renumbered UP 1200 in March 1980. By July of 1998, time had run out, and UP 1200 was retired from the roster and sold to Boise Locomotive. In April of 2000, it was leased from owner Diesel Supply to Circle 4 Farms in Milford, Utah, lettered as 'Hog Express'. Info from UtahRails.net
Rugged Little Beasts
Between 1978 and 1984, Union Pacific rebuilt 75 EMD SW7s, SW9s, and TR5As into a new switcher model, the SW10. The rebuild/upgrade included replacing the original 567 power assembly with a 645 prime mover. Other upgrades were made to the electrical, and cooling systems, control stand, electrical cab heating, refrigerator, and roller bearing trucks.
UP SW9 No. 1848 served as the prototype, and became the first of the 75. By Aug. 1979 it was released from Omaha for service, and renumbered UP 1200 in March 1980. By July of 1998, time had run out, and UP 1200 was retired from the roster and sold to Boise Locomotive. In April of 2000, it was leased from owner Diesel Supply to Circle 4 Farms in Milford, Utah, lettered as 'Hog Express'. Info from UtahRails.net