•YEARS BUILT: 1966-1975
•MANUFACTURER: EMD
•OPERATED ON: Most North American Class I freight railroads
•NAMES: Hustle Muscle, Flares, Speed Machines, Tunnel Motor (for SD45T-2)
•QUANTITY: 1,695 (1,312 SD45, SDP45), (383 SD45-2, SD45T-2)
•HORSEPOWER: 3,600
•KNOWN FOR: Angled radiators at the rear on the SD45, grills by walkways at end of long hood for SD45T-2
•STATUS: Most are retired. Some carbodies still active. A few in museums. Many SD45T-2s are still in service on regionals, short lines, industrials, and leasers.