Union Pacific Diesel Locomotives
UPY Yard Switch Units, Yard Slugs, Road Slugs, and CCRCL Units
This page was last updated on October 6, 2022.
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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 | 2005-2018 | 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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