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Union Pacific Railroad

Roster of Yard Slug Units

This page was last updated on August 24, 2014.

(Return to UP Diesel Roster Index Page)

Yard Slug -- 6 units
B-B trucks; (no engine); 235,300 pounds operating weight

Road
Number
Rebuild
Date
Rebuilt
From
Date
Retired

Notes
UP S1 Dec 1973 UP GP9B 176B 9 Feb 1987 Out of service June 1986; sold to Aaron Ferer and Sons, Omaha, Nebraska, in November 1987.
UP S2 Jun 1974 UP GP9B 341B 9 Feb 1987 Out of service May 1985; sold for scrap to Southwest Railroad Car Parts, Longview, Texas, 2 April 1987.
UP S3 Oct 1974 UP GP9B 301B 10 Sep 1982 Scrapped by UP at Omaha in September 1982.
UP S4 26 Sep 1975 UP GP9B 316B 28 Aug 1989 Sold for scrap to Pielet Brothers Scrap Iron & Metal, McCook, Illinois, 17 January 1990.
UP S5 9 Mar 1976 UP GP9B 314B 24 Apr 1989 Out of service April 1986; sold for scrap to Pielet Brothers Scrap Iron & Metal, McCook, Illinois, 17 January 1990.
UP S6 22 Sep 1976 UP GP9B 306B 28 Aug 1989 Sold for scrap to Pielet Brothers Scrap Iron & Metal, McCook, Illinois, 17 January 1990.

General Notes:

a. UP S1 to S6 were built by UP at Omaha from retired UP GP9Bs.
b. UP S1, S2, and S3 were originally equipped to operate only with SD7 slug control units. S4, S5, and S6 were originally equipped to operate only with SD24 slug control units; all were later modified to operate with either SD7, SD24, and later, SD40 slug control units; these combinations were called ten motor slug sets.
c. Prior to being rebuilt to Slug S5, GP9B 314B was out of service for 239 days, since July 1974, because of an electrical fire.
d. UP S4 and S5 were equipped with external sand boxes in October 1980, similar to those applied to the DDA40X, DDA35, and DD35 B-unit road freight locomotives.
e. Car body of UP S6 was cut down to 77 inches in May 1985 at Salt Lake City, to improve visibility from the attached power unit.
f. The six GP9 yard slugs were originally equipped to operate only with SD7 or SD24 slug control units; all six slugs were later modified to operate either with SD40 slug control units. (List of yard slugs and their paired control units)
   

Yard Slug -- 2 units
C-C trucks; 393,000 pounds operating weight

Road
Number
Rebuild
Date
Rebuilt
From
Date
Retired

Notes
UP S7 31 Jan 1978 UP SD24B 406B 17 Jul 1989 Sold for scrap to Pielet Brothers Scrap Iron & Metal, McCook, Illinois, 17 January 1990.
UP S8 Dec 1978 UP SD24B 444B 9 Feb 1987 Wrecked during late April 1985 at North Platte, Nebraska; out of service May 1985; sold for scrap to Aaron Ferer and Sons, Omaha, Nebraska, in November 1987.

General Notes:

a. UP S7 and S8 built by UP at Omaha from retired UP SD24Bs.
b. UP S7 and S8 were originally equipped to operate only with SD24 slug control units; both slugs were later modified to operate with SD40 slug control units; these combinations were called twelve motor slug sets. (List of yard slugs and their paired control units)
   

Yard Slug Model SL-1 -- 23 units
B-B trucks; (operating weight, see note below)

Road
Number
Previous
Number
Date To
UP Number
UPY
Number
Date To
UPY Number
Date
Retired
Notes
UP S9 MP 1400 19 Aug 1986 UPY 903 10 May 2003   1
UP S10 MP 1401 30 Sep 1986 UPY 904 1 Sep 2000    
UP S11 MP 1402 13 Jul 1990 UPY 905 6 Mar 2002    
UP S12 MP 1403 29 Jan 1988        
UP S13 MP 1404 29 Jan 1987 UPY 102 22 Jan 2002 25 May 2001 2
UP S14 MP 1405 16 Mar 1988     31 Aug 2000  
UP S15 MP 1406 27 Jan 1988     31 Aug 2000  
UP S16 MP 1407 21 Aug 1988 UPY 910 12 Feb 2003    
UP S17 MP 1408 21 Aug 1988 UPY 911 22 Apr 2002    
UP S18 MP 1409 3 Oct 1988        
UP S19 MP 1410 11 Nov 1986 UPY 913 13 Feb 2004    
UP S20 MP 1411 25 Sep 1986 UPY 100 10 Dec 2001 29 Nov 2000 2
UP S21 MP 1412 10 Jan 1986 UPY 915 6 Nov 2003    
UP S22 MP 1413 10 Mar 1986 UPY 916 11 Mar 2002    
UP S23 MP 1414 11 Mar 1986     8 Apr 2009  
UP S24 MP 1415 26 Dec 1985       3
UP S25 MP 1416 31 Mar 1986       3
UP S26 MP 1417 19 Oct 1987 UPY 101 22 Jan 2002 19 Dec 2000 2
UP S27 MP 1418 28 Jan 1988 UPY 921 23 Mar 2001    
UP S28 MP 1419 3 Oct 1988        
UP S29 MP 1420 30 Sep 1988 UPY 923 11 Oct 2001    
UP S30 MP 1421 9 Sep 1988 UPY 924 20 May 2000    
UP S31 MP 1422 1 Feb 1988 UPY 925 18 Feb 2000    

General Notes:

a. Rebuilt from retired MP SW7s, SW8s, and SW9s by MP Pike Avenue Shops, North Little Rock, Arkansas; mated with MP15s and, beginning in October 1990, GP38-2s.
b. UP Yard Slugs S9 to S13 had operating weight of 246,000 pounds; UP S14 to S31 had operating weight of 261,000 pounds.
c. An excellent source of information about MP's yard slugs was published by the Missouri Pacific Historical Society in "The Eagle", Volume 15, Number 4, Winter 1990, including how to build a model of one of the units.
d. UP S16-S18 (as MP 1407-1409) were first painted UP yellow and gray, with Missouri Pacific lettering, in May and July 1985 while assigned to Houston; relettered to UP S16-S18 in August and October 1988.
e. Renumbered to UPY 903-925.
f. Individual unit histories:
  Road
Number
Previous
Number
Rebuild
Date
Rebuilt
From
Date To
MP Yellow
  UP S9 MP 1400 30 Dec 1978 MP SW7 1206  
  UP S10 MP 1401 1 Mar 1979 MP SW8 8003  
  UP S11 MP 1402 Jun 1979 MP SW8 8001  
  UP S12 MP 1403 Sep 1979 MP SW8 8007  
  UP S13 MP 1404 May 1980 MP SW8 8002  
  UP S14 MP 1405 Jun 1980 MP SW7 1214  
  UP S15 MP 1406 Jul 1980 MP SW8 8000  
  UP S16 MP 1407 Aug 1980 MP SW7 1211 26 May 1985
  UP S17 MP 1408 Sep 1980 MP SW7 1213 2 Jul 1985
  UP S18 MP 1409 Oct 1980 MP SW8 8004 16 May 1985
  UP S19 MP 1410 Nov 1980 MP SW9 1228  
  UP S20 MP 1411 Dec 1980 MP SW7 1210  
  UP S21 MP 1412 Dec 1980 MP SW9 1221  
  UP S22 MP 1413 Apr 1981 MP SW9 1235  
  UP S23 MP 1414 May 1981 MP SW8 8006  
  UP S24 MP 1415 Jul 1981 MP SW7 1204  
  UP S25 MP 1416 Aug 1981 MP SW8 8005  
  UP S26 MP 1417 Sep 1981 MP SW7 1215  
  UP S27 MP 1418 Oct 1981 MP SW7 1212  
  UP S28 MP 1419 Oct 1981 MP SW9 1219  
  UP S29 MP 1420 Nov 1981 MP SW9 1217  
  UP S30 MP 1421 Dec 1981 MP SW9 1218  
  UP S31 MP 1422 Jan 1982 MP SW9 1220  

Note:

1. UP S9, as MP yard slug 1206, was completed as MP's first yard slug in November 1978 and was initially mated with MP SW1200 1275; MP 1206 was renumbered to MP 1400 on 30 December 1978.
2. UP S13, S20, and S26 were converted in December 2001 and January 2002 for service as CCRCL control units for remote control switcher/slug power sets; completed as UPY 100-102.
3. UP S24 and S25 were retired in December 2000; reinstated on 11 January 2001, but as of February 2008, the units remain stored at Pine Bluff, Arkansas. (information from Kermit Geary, via email to LocoNotes discussion group, February 13, 2008)
   

Yard Slug Model SL-4B -- 3 units
B-B trucks; 262,000 pounds operating weight

Road
Number
First
Number
Rebuild
Date
Rebuilt
From
Date
Retired
(UP S1) SP 1010 Jun 1979 L&N SW7 2247 31 Aug 2000
  SP 1011 Jun 1979 L&N NW2 2210  
(UP S2) SP 1012 Jul 1979 L&N NW2 2206 31 Aug 2000
(UP S3) SP 1013 Aug 1979 L&N NW2 2204 31 Aug 2000

General Notes:

a. Original total of four units; three units went to UP at merger; SP retired 1011 prior to the merger.
b. SP 1010-1013 were rebuilt by General Electric, Minneapolis, from four former L&N switchers (three NW2s and an SW7); all were initially assigned to Roseville, California, with MP15ACs.
c. Assigned UP S1-S3 in September 1997, not renumbered; assigned UPY 900-902 in December 1999, not renumbered.
   

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