The Union Pacific Class S-6 was a class of 0-6-0 switcher type steam locomotives built by the Lima Locomotive Works (LLW) for the Union Pacific Railroad (UP).
History Between October and November 1920, the Lima Locomotive Works (LLW) had manufactured 30 locomotives for the Union Pacific Railroad (UP), the 30 locomotives were designed as switchers, performing switch work in the railroad's yards.
The class was retired by Union Pacific, with the first being taken out of service in 1947, and the last locomotive was removed from service in 1962.
4453 and 4455 were sold to the Monolith Portland Cement Company based in Laramie, Wyoming, with 4455 being sold in 1949, and 4453 being sold in 1955. 4457 was sold to St. Joseph Terminal Company based in St. Joseph, Missouri. 4464 was sold to Bunker Hill and Sullivan Mining and Concentrate Company based in Kellogg, Idaho. 4466 was assigned as the Cheyenne shop switcher until it was moved to Grand Island, Nebraska, prior to April 1960.
Accidents and incidents UP 4476 had derailed and had wrecked itself on March 7, 1947, at Grand Island, Nebraska, it was retired in April 1947 and was scrapped.
Fleet numbers No.Built dateSerial numberFirst run dateRetirement dateDisposal dateNotesUP 4451October 19205988 - -December 1953UP 4452October 19205989 - -May 1947UP 4453October 19205990 -1968October 1955UP 4454October 19205991 - -November 1947UP 4455October 19205992 -1970January 1949On static display at the Colorado Railroad Museum in Golden, Colorado.UP 4456October 19205993 - -April 1954ScrappedUP 4457October 19205994 - -March 1948UP 4458October 19205995 - -March 1947UP 4459October 19205996 - -June 1956ScrappedUP 4460October 19205997 - -December 1953UP 4461October 19205998 - -July 1956UP 4462October 19205999 - -July 1956UP 4463October 19206000 - -May 1947UP 4464October 19206001 - -July 1954UP 4465October 19206002 - -February 1947UP 4466October 19206003 - July 1962 (revenue service) 1999 (excursion service)July 1962On static display at the California State Railroad Museum in Sacramento, California.UP 4467October 19206004 - -March 1954UP 4468October 19206005 - -March 1952UP 4469October 19206006 - -May 1947UP 4470October 19206007 - -July 1947UP 4471October 19206008 - -July 1956ScrappedUP 4472October 19206009 - -November 1947UP 4473October 19206010 - -April 1947UP 4474October 19206011 - -March 1957UP 4475October 19206012 - -July 1956UP 4476October 19206013 -April 1947April 1947Wrecked on March 7, 1947, at Grand Island, Nebraska.UP 4477October 19206014 - -July 1956UP 4478October 19206015 - -March 1954UP 4479October 19206016 - -March 1954UP 4480November 19206017 - -February 1954
Preservation Two locomotives were preserved: UP 4455 - On static display at the Colorado Railroad Museum in Golden, Colorado. UP 4466 - On static display at the California State Railroad Museum in Sacramento, California.
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