| Big Boy 4024 poses on the turntable at Ogden shortly after its delivery to the railroad. Due to wartime traffic demands, a second group of five Big Boys was ordered by UP from ALCO in 1943. These five (UP 4020-4024) would supplement the original 20 (UP 4000-4019) on the Wasatch grade. Being delivered in 1944, these five received little fanfare, and were immediately thrown into service, save for a photo op with UP 4024. Obtained from Union Pacific Steam: Big Boy Portraits (Bush, Ehernberger) |