A spanking clean SD24 waits to take a train east at UP's East Los Angeles engine facility.

A 2400 horsepower EMD SD24 has been serviced and awaits an assignment at Provo Yard on March 5, 1977. The UP rostered 34 'A' units with cabs and 45 'B' cabless booster units, built between 1958 an... (more)

A Union Pacific SD24 awaits a call in Provo Yard on Sept. 12, 1976. The 2400 HP six axle unit was built by EMD for the UP in Sept. 1959 from a roster of 34 SD24s and 45 SD24Bs. It was retired fro... (more)