All-Time UP Diesel Roster
Compiled by Don Strack
(Click here for updates.)
Current Roster Data
Current Roster Index — An index page to Union Pacific's current diesel locomotive fleet. (For groups of units either fully renumbered or fully retired since 2000, see the Modern Era Index, below.)
UPY Units — An index page to all of Union Pacific's recent, beginning in 2000, UPY (Union Pacific Yard) units, including the UPY 900 series yard slugs and road slugs.
Heritage Fleet Index — An index page to the fleet of steam and diesel locomotives UP has kept to honor its heritage.
Earlier Roster Data
Modern Era Index — An index page to Union Pacific's diesel locomotive fleet during the Modern Era that began in the year 2000, stemming from the December 1999 renumber plan that called for the general renumbering of over 3,700 locomotives to accommodate the arrival of 1,000 SD70Ms beginning in 2000. Includes all new units and units retired since 2000.
Late Merger Era Index — An index page to Union Pacific's diesel locomotive fleet during the 1995-1999 Late Merger Era, including the UP control of C&NW in 1995, and control of SP (including D&RGW and Cotton Belt) in 1996.
Early Merger Era Index — An index page to Union Pacific's diesel locomotive fleet during the 1983-1994 Early Merger Era, including the UP control of MP and WP in 1983, and control of MKT in 1988.
Classic Era Index — An index page to Union Pacific's diesel locomotive fleet during the 1934-1982 Classic Era.
For an excellent photo-illustrated roster of UP classic era diesel locomotives, see Diesels of the Union Pacific, The Classic Era, Volumes 1 & 2:
Volume 1 has 224 pages; 308 black & white photographs; abbreviated bibliography; 14-page 1934-1982 chronology of Union Pacific diesel locomotives; four-page summary of road numbers, with years in service; four-page summary of locomotive model quantities; 40-page history of Union Pacific dieselization; 153-page unit-by-unit roster of Union Pacific diesel and turbine locomotives numbered from 1 to 999. (Withers Publishing Co.) (ISBN 1-881411-24-9)
Volume 2 has 176 pages; 257 black & white photographs; 73 color photographs; 12-page summary of Union Pacific diesel locomotive paint schemes and lettering for the 1934-1982 era; abbreviated bibliography; four-page summary of road numbers, with years in service; 129-page unit-by-unit roster of Union Pacific diesel locomotives numbered from 1000 to 903999. (Withers Publishing Co.) (ISBN 1-881411-29-X)
Yard Slugs, Road Slugs, and Miscellaneous Units — An index page to all of Union Pacific's yard slugs, road slugs and other miscellaneous units prior to the UPY series. Includes the GE 44 ton unit and the all-electric E-100.
Temporary WP Numbers — A page showing the temporary WP road numbers, after the WP reporting mark was reinstated for use on locomotives. Needed to allow road numbers of still-on-property retired locomotives to be used on renumbered locomotives.
General Roster Notes — An web page with information about these on-line rosters, and the model designations used, along with a brief discussion of how builder dates are presented.
Diesel Roster Changes — An index page for changes to UP's diesel locomotive roster, from 1996 through 2000. (Please note that all of these changes have all been incorporated into the roster listings themselves.)
Switchers and Slugs — An index page of text-only documents used for the publication of "Union Pacific Switchers and Slugs", authored by Don Strack and published in 1996 by Withers Publishing Co.
The "Union Pacific Switchers and Slugs" book has 116 pages; 238 black and white photos; 37 color photos; and full rosters of all of UP's EMD, Alco, Baldwin, and GE switchers, plus its yard slugs and road slugs, and is still available from the publisher.
"Serves All The West" — A history of Union Pacific dieselization, from 1934 to 1982. An edited and updated version of the text used in Diesels of the Union Pacific, 1934-1982, The Classic Era, Volume 1 (ISBN 1-881411-24-9), and Diesels of the Union Pacific, 1934-1982, The Classic Era, Volume 2 (ISBN 1-881411-29-X), both by Don Strack (Withers Publishing Co., 1999 and 2005)
(These two books, which have hundreds of photos, are still available from the publisher. Click here for more information, and here for a link to the book at Withers Publishing.)
Overall Fleet Information
Motive Power Chronology — Full chronologies for Union Pacific's motive power, from 1915 to 2001:
- 1915-1933 — Steam Era (Steam only)
- 1934-1982 — Late Steam Era and Classic Era (Steam and Diesel)
- 1983-2001 — Early Merger Era, Late Merger Era, and Modern Era (Diesel only)
Model Summary — A page listing of all of the locomotive models on UP, from 1934 through 2002, sorted by builder and type.
Merger Partners
Rock Island to UP Index — An index page to the former Chicago, Rock Island & Pacific (Rock Island) locomotives that were returned to UP in April 1980 upon the shut down of the Rock Island due to its bankruptcy. Included are units assigned new UP road numbers, and units that were not assigned new UP road numbers.
MP to UP Index — An index page to the former Missouri Pacific locomotives that came to UP during the 1983 control of MP by UP, including MP units both assigned new UP road numbers, and MP units that were not assigned new UP road numbers.
WP to UP Index — An index page to the former Western Pacific locomotives that came to UP during the 1983 control of WP by UP. (The roster of all former WP units is also on this same page.)
- WP Roster Notes — Additional information about the WP diesel locomotive fleet after the UP merger.
- WP Dispositions — Dispositions of WP diesel locomotives after the UP merger, up to 1987. (from CTC Board, August 1987)
MKT to UP Index — An index page to the former Missouri Kansas Texas locomotives that came to UP during the 1988 control of MKT by UP. (The roster of all former MKT units is also on this same page.)
C&NW to UP Index — An index page to the former Chicago & North Western locomotives that came to UP during the 1995 control of C&NW by UP, including C&NW units both assigned new UP road numbers, and C&NW units that were not assigned new UP road numbers. (Click here for an all-time, on-line C&NW diesel roster)
- For an excellent photo-illustrated, all-time C&NW diesel locomotive roster, see Diesels Of The Chicago & North Western (Withers Publishing Company, 1995) (ISBN 1-881411-07-0)
SP to UP Index — An index page to the former Southern Pacific, Cotton Belt (SSW), and Denver & Rio Grande Western locomotives that came to UP during the 1996 control of SP by UP, including SP, SSW, and D&RGW units both assigned new UP road numbers, and SP, SSW, and D&RGW units that were not assigned new UP road numbers.
