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Union Pacific Diesel Locomotives

UPY Yard Switch Units, Yard Slugs, Road Slugs, and CCRCL Units

This page was last updated on August 19, 2015.

(Return to Union Pacific Diesel Index Page)

Overview

Adopted in October 1999, the new UPY reporting mark was needed to allow for future growth in UP's roster without going to a five-digit number. Five-digit numbers could not be considered because of the myriad of computer systems UP uses and must communicate with, many of which are not programmed to allow anything other than four-digit numbers for locomotives. To reprogram the computer systems to allow five-digit numbers was seen as an unnecessary expense. Other possibilities were considered, including assigning the switcher fleet to one of UP's still-active subsidiary companies, such as Chicago Heights Terminal Transfer (CHTT), but complications in labor agreements, and financial and corporate organization dictated that the new reporting mark be used instead.

When the UPY reporting mark was adopted in 1999, of the total roster of 6,841 units, 3,743 units were to be be renumbered over the next two years (late 1999-2002), including 632 switching units (GP15-1, SD38-2s, SW1500s, MP15DCs and MP15ACs) that will be changed to UP's new UPY reporting mark, along with 36 yard and road slug units.

The first UPY unit was an SD40-2 rebuilt to an SD38-2, completed on December 17, 1999. The first renumbered unit was a GP15-1 renumbered on Decdember 22, 1999.

(Read more about the 1999 renumbering plan)

Index

Road
Number
Previous
Number
Pre-Merger
Number
Model Qty In-Service
Years
Notes
UPY 100-104     Yard Slug/
CCRCL
3 2001- Control units for remote control yard switch operations; former MP yard slugs
UPY 105-174     CCRCL 70 2003- Control units for remote control yard switch operations; former MP and SP/SSW GE B23-7 and B30-7 units
UPY 541 UP 1666 MP 1666 GP15-1 1 2002- To avoid use of UPY 666
UPY 542-544 UP 1542-1544   GP15-1 3 2000-2002 Lease expired in 2002; returned to owner.
UPY 545-554 UP 1548, 1554 C&NW 4400-4410 GP15-1 10 2000- UPY 548 and 554 from UP 1548 and 1554; others renumbered direct from C&NW numbers
UPY 555-714 UP 1555-1714 MP 1555-1714 GP15-1 160 2000- UPY 666 is blank and not used
UPY 715-744 UP 1715-1744 MP 1715-1744 GP15AC 30 2000-  
UPY 800-805 UP 2800-2805   SD38-2 6 2001-  
UPY 806-815 UP 2806-2815 C&NW 6650-6659 SD38-2 10 2001-  
UPY 816-823 UP 2816-2823   SD38-2 8 2001- Various ex MP SD40-2s
UPY 824 UP 2824   SD38-2 1 2002-  
UPY 825-829 UP 2825-2829   SD38-2 5 2001- Various ex MP SD40-2s
UPY 830-835 UP 2830, 2832 SP 2971-2976 SD38-2 6 2002- UPY 830, 832 from UP 2830, 2832; others renumbered direct from SP numbers
UPY 836-846 UP 2836-2846   SD38-2 11 2001- Various ex MP SD40-2s
UPY 847-868     SD38-2 22 1999- Various UP and ex MP SD40-2s
UPY 894-899     RP20SD 6 2008- Rebuilt from various retired UP and ex MP SD40-2s
UPY 903-925 UP S9-S31 MP 1400-1422 Yard Slug 23 2001-  
UPY 926 UP S300 MKT 501 Road Slug 1 2001-  
UPY 927-929 UP S301-S303   Road Slug 3 2001-  
UPY 931-938 UP S311-S320 SP 1601-1613 Road Slug 10 2001-  
UPY 939, 940 UP 977, 963   Road Slug 2 2003- Rebuilt from retired ex MP GP50s
UPY 1000-1003 UP 1000-1031   SW1500 4 2000-  
UPY 1004-1031 UP 1004-1031   SW1500 28 2000-2003  
UPY 1036-1039 UP 1324-1327 MKT 52-55 SW1500 4 2000-2003  
UPY 1040-1042 UP 1315-1317 WP 1501-1503 SW1500 3 2001-  
UPY 1084 UP 1059   SW1500 1 2000-  
UPY 1112 UP 1112 (2nd)   SW1500 1 2002-  
UPY 1060-1233 UP 1060-1233 SP/SSW 2451-2689 SW1500 106 2000-  
UPY 1289 UP 1289   MP15DC 2 2000-2002 Lease expired in 2002; returned to owner
UPY 1291-1299 UP 1296 SP 2690-2701 MP15DC 9 2000- UPY 1296 from UP 1296; others renumbered direct from SP numbers
UPY 1300-1314 UP 1300-1314   MP15DC 15 2000-  
UPY 1315-1328 (UP 1315-1328) C&NW 1302-1316 MP15DC 14 1995- None renumbered to UP 1315 series
UPY 1330-1392 UP 1330-1392 MP 1530-1554,
MP 1356-1392
MP15DC 62 2000- UPY 1355 blank and not used
UPY 1393-1396 UP 1393-1396 MKT 56-59 MP15AC 4 2001-  
UPY 1397-1428 UP 1397-1428   MP15AC 32 2000-  
UPY 1429, 1430 UP 1429, 1430   MP15AC 2 2001-2002 Lease expired in 2002; returned to owner
UPY 1431-1487 UP 1431-1487 SP 2702-2759 MP15AC 57 2000-  
UPY 1488 UP 1488   MP15AC 1 2001-  
UPY 2004     GG20GP 1 2005-2008 Railpower Greengoat battery-diesel hybrid switcher; retired in 2008 for conversion to Gen-Set design
UPY 2005     GS14B 1 2005- NRE Truck Engine Switcher (Gen-Set)
UPY 2100-2112     MP20GP 13 2006- Rebuilt by MotivePower from former MP GP50 units
UPY 2300-2319     GG20GE 20 2005- Railpower Greengoat battery-diesel hybrid switchers
UPY 2602-2699     RP20GE 98 2006- Railpower Gen-Set units
UPY 2701-2760     GS21B 60 2007- NRE Gen-Set units
UPY 3200-3207 UP 3200 series   SD40-2R 8 2008-  
UPY 3831 UP 3831 MKT 623 SD40-2 1 2004-  

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