Union Pacific Class T-57 #1242 is on display in the Cheyenne Botanic Gardens on Carey Ave not far off Exit 11 on the I-25. The locomotive, known as "The 1242" as well as "Old Sadie", is a Ten Wheeler (4-6-0) type built in 1890 in the Patterson, NJ, workshops of the Cooke Locomotive & Machine Works (later part of Alco).
With a 23' 9½" engine wheelbase and 13' driver wheelbase, it weighs 154,400 lbs, 125,600 lbs on its 57" drivers. The grate area is 31 sq ft, the firebox 174.6 sq ft and the total heating surface is 1,819 sq ft. It has 20" x 26" cylinders and, operating at a boiler pressure of 190 psi, it delivered 29,467 lbs tractive effort. The tender weighs 110,204 lbs and has a capacity of 14 tons of coal and 7,000 gallons of water.
#1242 was donated to the City of Cheyenne, WY, in 1955 and is one of the oldest surviving locomotives from the Union Pacific roster. It is one of only two surviving engines owned by the Union Pacific from the era when E. H. Harriman controlled the railroad. You can see the other, another T-57 on the UP #1243 page of this website.