Union Pacific 4466

Union Pacific 4466 is an 0-6-0 type steam locomotive built in October 1920 for the Union Pacific Railroad (UP) to perform switching chores and transfer runs.

Union Pacific 4466
Type and origin
Power typeSteam
BuilderLima Locomotive Works
Serial number6003
Build dateOctober, 1920
Gauge4 ft 8 12 in (1,435 mm)
Driver dia.51 in (1,295 mm)
Adhesive weight159,000 lb (72,000 kg)
Loco weight159,000 lb (72,000 kg)
Fuel typeCoal
Cylinder size21 in (530 mm) dia × 26 in (660 mm) stroke
Performance figures
Tractive effort34,400 lbf (153,000 N), 78,000 lbf (350,000 N) with booster
OperatorsUnion Pacific
Current ownerCalifornia State Railroad Museum


UP 4466 spent most of its career in Cheyenne, Wyoming, as a shop switcher and was the UP Cheyenne Shop's last steam shop switcher. After its stint in Cheyenne, 4466 was transferred to Grand Island, Nebraska, remaining there until 1973.[1]

In 1978, No. 4466 was donated to California State Railroad Museum. In 1984, it was restored to service and pulled museum excursions. In 1986, 4466 ventured to Vancouver, British Columbia, to be part of Steam Expo '86.[2]

Since at least 1999, UP 4466 now resides in retirement, and is currently a static display at the California State Railroad Museum.


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