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UP SD24 415 models its as-delivered livery at Los Angeles, CA, on August 11, 1962. Note the placement of the horn on the cab roof and the letter X in the numberboard. The Union Pacific was still displaying train numbers in the numberboards at this time. The box on the walkway behind the cab housed signal equipment. The edge of the green anti-glare panel on top of the short hood is barely visible in this view. Decals: Microscale 87-169. Leo Caloia photo, Bill Linley collection and renumbered 3100. It was immediately recognizable with its raised long hood, sealed carbody, modified dynamic brake and oil-cooler housing and raised walkway on the firemans side. It was renumbered from 3100 to 3200 to 3399 to 3999 and finally to 99. It finished its career in yard service with its modifications not deemed successful enough to be implemented on other SD24s. Unit 414 also was upgraded and equipped with 645 power assemblies, but this was also not repeated. Beginning in 1972, repainted units bore the We Can Handle It slogan. This variation gave way in 1975 to the larger 20" lettering for the roadname and the UP shield on the cab side. Finally in 1980, the larger number was moved to the cab side, and the shield was removed from that location. In 1964, the first SD35 replaced the SD24, and the following year, the road bought ten dual-service SDP35s. Two years later, the first of hundreds of SD40s began arriving, and the role of the SD24 started its decline from solid sets on the priority trains to mixing with other models on general freights. The fleet labored on more than another decade until 1977 when the first group, eight A units and 32 B units were sold to Precision National Corp. Many of these units were rebuilt and later sold to the Chicago & North Western while others went to the ICG and went through the SD20 program at Paducah Shops. Four booster units, numbers 401B, 420B, 436B and 437B retired the following year, were rebuilt into yard slugs for the Santa Fe and were found MUd with that roads SD26s in yard service. Two more B units, numbers 406B and 444B became yard slugs S-7 and S-8, respectively. The last B units to be retired were the 408B and 411B in 1981. The A-unit retirements continued through the first half of the 1980s with five A units, including former demo 446, lasting until 1985.
UP SD24 423 leads two boosters across the California desert in July 1965 in the service for which UP bought the SD24 fleet. Note the wind deflectors and canvas sunshade. There is a large rerailer hanging from each truck on the cab unit. Three years later, this unit would be rebuilt to SD24M 3100. Decals: Microscale 87-169. Ted Wickson photo, Bill Linley collection
UP SD24 425 wears the We Can Handle It slogan initiated in 1972 and lacks the black edging to the lettering that was eliminated briefly in 1972-73. There is a rotating beacon on the cab roof. Salt Lake City, UT; September 4, 1977. Decals: Microscale 87-169. D. L. Zeutschel photo, George Melvin collection
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