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 | 1 |
UP S2 | Jun 1974 | UP GP9B 341B | 9 Feb 1987 | 2 |
UP S3 | Oct 1974 | UP GP9B 301B | 10 Sep 1982 | 3 |
UP S4 | 26 Sep 1975 | UP GP9B 316B | 28 Aug 1989 | 4 |
UP S5 | 9 Mar 1976 | UP GP9B 314B | 24 Apr 1989 | 5 |
UP S6 | 22 Sep 1976 | UP GP9B 306B | 28 Aug 1989 | 6 |
General Notes:
- UP S1 to S6 were built by UP at Omaha from retired UP GP9Bs.
- 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.
- Prior to being rebuilt to Slug S5, GP9B 314B was out of service for 239 days, since July 1974, because of an electrical fire.
- 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.
- 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.
- 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 with SD40 slug control units. (List of yard slugs and their paired control units)
Notes:
- UP S1 was out of service June 1986; sold to Aaron Ferer and Sons, Omaha, Nebraska, in November 1987.
- UP S2 was out of service May 1985; sold for scrap to Southwest Railroad Car Parts, Longview, Texas, 2 April 1987.
- UP S3 was scrapped by UP at Omaha in September 1982.
- UP S4 was sold for scrap to Pielet Brothers Scrap Iron & Metal, McCook, Illinois, 17 January 1990.
- UP S5 was out of service April 1986; sold for scrap to Pielet Brothers Scrap Iron & Metal, McCook, Illinois, 17 January 1990.
- UP S6 was sold for scrap to Pielet Brothers Scrap Iron & Metal, McCook, Illinois, 17 January 1990.
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 | 1 |
UP S8 | Dec 1978 | UP SD24B 444B | 9 Feb 1987 | 2 |
General Notes:
- UP S7 and S8 built by UP at Omaha from retired UP SD24Bs.
- 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)
Notes:
- UP S7 was sold for scrap to Pielet Brothers Scrap Iron & Metal, McCook, Illinois, 17 January 1990.
- UP S8 was 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.
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:
- 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.
- UP Yard Slugs S9 to S13 had operating weight of 246,000 pounds; UP S14 to S31 had operating weight of 261,000 pounds.
- 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.
- Renumbered to UPY 903-925.
- 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 |
Notes:
- 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.
- 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.
- 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.
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:
- Original total of four units; three units went to UP at merger; SP retired 1011 prior to the merger.
- 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.
- Assigned UP S1-S3 in September 1997, not renumbered; assigned UPY 900-902 in December 1999, not renumbered.
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