Union Pacific Diesel Locomotives
Yard Slugs, Road Slugs, and Miscellaneous Units
This page was last updated on August 24, 2014.
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S Series Yard Slugs
| Road Number |
Previous Number |
Pre-Merger Number |
Model | Qty | In-Service Years |
Notes |
| UP S1-S6 | Retired GP9Bs | Yard Slug | 6 | 1973-1989 | ||
| UP S1-S3 | SP 1010, 1012, 1013 | Yard Slug | 3 | 1996-2000 | ||
| UP S7, S8 | Retired SD24B | Yard Slug | 2 | 1978-1989 | ||
| UP S9-S31 | MP 1400-1422 | Yard Slug | 23 | 1983- | Renumbered to UPY 903-925 |
S Series Road Slugs
| Road Number |
Previous Number |
Pre-Merger Number |
Model | Qty | In-Service Years |
Notes |
| UP S50 | MKT 501 | Road Slug | 1 | 1988-1991 | ||
| UP S300 | UP S50 | MKT 501 | Road Slug | 1 | 1988- | Renumbered to UPY 926 |
| UP S301-S303 | Road Slug | 3 | 1991- | Renumbered to UPY 927-929 | ||
| UP S310 | SP 1600 | Road Slug | 1 | 1996- | Renumbered to UPY 930 | |
| UP S311-S320 | SP 1601-1613 | Road Slug | 10 | 1996- | Renumbered to UPY 931-938 |
Miscellaneous Units
| Road Number |
Previous Number |
Model | Qty. | In-Service Years | Notes |
| LA&SL E-100 | Electric | 1 | 1931-1942 | To Yakima Valley Transit 297 | |
| UP 1399 | GE 1399 | GE 44 ton | 1 | 1947-1956 | Renumbered to UP 03999 in 1959 |
| UP 03999 | UP 1399 | GE 44 ton | 1 | 1956-1959 | Renumbered to UP 903999 in 1959 |
| UP 903999 | UP 03999 | GE 44 ton | 1 | 1959-1972 |
Roadway Units
| Road Number |
Model | Qty. | In-Service Years | Notes |
| UP-1 to UP-5 MW-1 to MW-8 |
Gas-Mechanical, Diesel-Mechanical, Diesel-Electric |
7 | 1923-1978 | Tie plant units, 29-1/2 inch gauge (More informationthe tie plant units) |
| (no number) | Diesel-Mechanical | 1 | 1971-1978 | Standard gauge |
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