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Union Pacific's Two-Tone Gray 4-6-2 Pacifics

This page was last updated on October 12, 2008.

Of a total fleet of 209 locomotives in its P-class 4-6-2 Pacific locomotives, just 14 are known to have received two-tone gray.

The locomotive numbers were: UP 2906, 3114, 3119, 3121, 3131, 3134, 3135, 3136, 3137, 3138, 3179, 3219, 3221 and 3222. (initial research by Bob Darwin and Jim Ehernberger)

All Pacifics that received two-tone gray were known as "Heavy Pacifics" by UP.

By the time that two-tone gray began being applied to the passenger locomotive fleet in 1946, there were 125 locomotives remaining in the class, which included both Light Pacifics and Heavy Pacifics. The extreme operations during World War II had forced UP to continue using many of its obsolete and out-of-date locomotives, with the last Pacific retirements prior to 1946 taking place in May 1940. By the time retirements resumed in July 1946, there were enough modern passenger locomotives in the 4-8-4 Northern FEF class, along with new diesel locomotives, that only fourteen (maybe one or two more) Pacifics received two-tone gray.

The 4-6-2 Pacific fleet can be broken down as follows:

Photo Research:

Road Number Date Retired Photo Date Reference
(see below)
Location/Train
UP 2906 Jul 1951 27 Nov 1947 (4) p. 117 Omaha
OSL 3114 Jul 1950 23 May 1947 (3) p. 43 Idaho Falls, Idaho/Train 34
OSL 3114 Jul 1950 26 Sep 1948 (7) p. 67 Pocatello, Idaho (dead line)
OSL 3119 Jul 1950 Aug 1947 (7) p. 68 Ogden, Utah/Train 31, Butte Express
OSL 3121 Jul 1950      
OSL 3131 Jan 1955      
OSL 3134 Sep 1954      
OSL 3135 Jan 1955   (1) p. 205 Trute, Idaho/Park Special, Train 35
OSL 3136 Jan 1955      
OSL 3137 Mar 1955 1951 (3) p. 47 Victor, Idaho/Train 47 (Teton Valley Branch)
OSL 3138 Jan 1955      
LA&SL 3179 Nov 1947      
OWR&N 3219 Mar 1955 2 Sep 1950 (3) p. 104 Wallace, Idaho/Train 67 (local)
    31 May 1951 (6) p. 32 Tekoa, Washington/Train 68
    1 Jun 1951 (5) p. 267 Palouse, Washington/Train 68
OWR&N 3221 Dec 1954 1947 (4) p. 116 Albina, Oregon.
OWR&N 3222 Dec 1954 Spring 1949 (5) p. 255 Juniper, Oregon/Train 151
    7 May 1950 (2) p. 181 Kansas City

Photo sources:

1. Kratville, Wm. Golden Rails (Kratville Publications, 1965)
2. Ehernberger, James L. and Francis G. Gschwind. Union Pacific Steam, Eastern District (E&G Publications, 1975)
3. Ehernberger, James L. and Francis G. Gschwind. Union Pacific Steam, Northwestern District (E&G Publications, 1977)
4. Kratville, William. Motive Power of the Union Pacific (Barnhart Press, 1977)
5. Asay, Jeff. Union Pacific Northwest (Pacific Fast Mail, 1991)
6. Schumacher, David. The "Overland" Union Pacific Overland, Service Cars and Their Paint Schemes". Prototype Modeler, Volume 4, Number 1, August 1980, page 24.
7. Watson, James. Union Pacific Small Steam Power (Motive Power Services, 1985)

Sources without Two-Tone Gray Pacific photos: