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Union Pacific Diesel Locomotives

Yard Slugs, Road Slugs, and Miscellaneous Units

This page was last updated on August 24, 2014.

(Return to Union Pacific Diesel Index Page)

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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