Union Pacific Class 9000

Union Pacific Class 9000
UP 9000, the prototype of the class
Technical specifications
Manufacturer(s)	American Locomotive Company
Build date	1926–1930
Total produced	88
Classification	9000
Wheel arrangement	4-12-2
Rail gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Cylinders	Three
Boiler pressure	220 lbf/in2 (1.52 MPa)
Bore stroke	Outside (2): 27 in × 32 in (686 mm × 813 mm); Inside (1): 27 in × 31 in (686 mm × 787 mm)
Firegrate area	108.25 sq ft (10.057 m2)
Fuel type	Coal
Heating area	2,560 sq ft (238 m2)
Performance figures
Maximum speed	50 mph (80 km/h)
Tractive effort	96,646 lbf (429.9 kN)
Factor of adhesion	3.66
Service information
Running numbers	9000-9087
Disposition details
Disposition	One preserved remainder scrapped

The Union Pacific 9000 Class, also known as the UP-1 Class, was a series of 4-12-2 type steam locomotives built by the American Locomotive Company (ALCO) for the Union Pacific Railroad (UP) between 1926 and 1928. There were 88 locomotives in the class constructed overall. Out of them, only No. 9000 is the sole survivor of the class and the only remaining steam locomotive in the world with the 4-12-2 type wheel arrangement.

Production

The first fifteen locomotives were ordered and delivered to the UP in 1926 and were numbered 9000-9014. The second locomotives of fifteen were ordered in 1928 and were numbered 9015-9029.

Accidents and Incidents

• On October 20th, 1948, No. 9018 while operating at upland Kansas, suffered a crown sheet failure which resulted in a catastrophic boiler explosion. The explosion claimed the lives of three people: the locomotive's engineer, the fireman, and brakeman.

Preservation

No. 9000 is the only surviving member of its class. It is now on static display at the RailGiants Train Museum in Pomona, CA. As of 2023, with 4-8-4 type No. 844 and Big Boy No. 4014 used in excursion service with the UP's steam excursion program in Cheyenne, WY and Challenger No. 3985 and 2-10-2 type No. 5511 about to undergo restoration back to operating condition by the Railroading Heritage of Midwest America (RRHMA) in Silvis, IL, No. 9000 is, unfortunately, very unlikely to ever run again anytime soon.

In Pop Culture

• No. 9000 appeared in the Kidsongs song "The Locomotion".
• No. 9000 appeared in the movie "UP Last of the Giants".

Gallery

List of Members of the Union Pacific 9000 Class
UP-1 (Prototype):	9000 (Prototype)
UP-2:	9001 • 9002 • 9003 • 9004 • 9005 • 9006 • 9007 • 9008 • 9009 • 9010 • 9011 • 9012 • 9013 • 9014
UP-3 (Union Pacific):	9015 • 9016 • 9017 • 9018 • 9019 • 9020 • 9021 • 9022 • 9023 • 9024 • 9025 • 9026 • 9027 • 9028 • 9029
UP-3 (Oregon-Washington Railroad and Navigation Company):	9700 • 9701 • 9702 • 9703 • 9704 • 9705 • 9406 • 9707
UP-4:	9030 • 9031 • 9032 • 9033 • 9034 • 9035 • 9034 • 9035 • 9036 • 9037 • 9038 • 9039 • 9040 • 9041 • 9042 • 9043 • 9044 • 9045 • 9046 • 9047 • 9048 • 9049 • 9050 • 9051 • 9052 • 9053 • 9054
UP-5:	9063 • 9064 • 9065 • 9066 • 9067 • 9068 • 9069 • 9070 • 9071 • 9072 • 9073 • 9074 • 9075 • 9076 • 9077 • 9078 • 9079 • 9080 • 9081 • 9082 • 9083 • 9084 • 9085 • 9086 • 9087
UP-5 (Oregon Short Line):	9500 • 9501 • 9502 • 9503 • 9504 • 9505 • 9506 • 9507 • 9508 • 9509 • 9510 • 9511 • 9512 • 9513 • 9514
Fallen:	9001 • 9002 • 9003 • 9004 • 9005 • 9006 • 9007 • 9008 • 9009 • 9010 • 9011 • 9012 • 9013 • 9014 • 9015 • 9016 • 9017 • 9018 • 9019 • 9020 • 9021 • 9022 • 9023 • 9024 • 9025 • 9026 • 9027 • 9028 • 9029 • 9030 • 9031 • 9032 • 9033 • 9034 • 9035 • 9034 • 9035 • 9036 • 9037 • 9038 • 9039 • 9040 • 9041 • 9042 • 9043 • 9044 • 9045 • 9046 • 9047 • 9048 • 9049 • 9050 • 9051 • 9052 • 9053 • 9054 • 9063 • 9064 • 9065 • 9066 • 9067 • 9068 • 9069 • 9070 • 9071 • 9072 • 9073 • 9074 • 9075 • 9076 • 9077 • 9078 • 9079 • 9080 • 9081 • 9082 • 9083 • 9084 • 9085 • 9086 • 9087
Preserved:	9000