Union Pacific Railroad

General Notes:

1. Original total of 50 C&NW units, numbered C&NW 5050-5099 (the first GP50s built); 48 units went to UP at merger; C&NW retired two units (C&NW 5051 and 5096) prior to UP merger.
2. Renumbered from C&NW series to UP series out of C&NW sequence due to different mechanical configuration.
3. Assigned UP 900-947 in June 1995, 15 units renumbered; assigned UP 5510-5557 in June 1996, 46 units renumbered; assigned UP 1610-1657 in December 1999.
4. Of the 48 units to UP at merger, 15 were renumbered to the UP 900-947 group in June 1995 through June 1996 (UP 904, ex C&NW 5055, was the first, completed on 23 June 1995, and UP 921, ex C&NW 5079, was the last, completed on 11 June 1996).
5. Of the 48 units to UP at merger, 46 units were renumbered to the UP 5510-5557 group in June 1996 through November 1997 (UP 5542, ex UP 933, C&NW 5056, was the first, completed on 26 June 1996 (six units were overhauled and repainted by Boise Locomotive Co., Boise, Idaho, with the remainder being completed by UP at Jenks Shops in North Little Rock, Arkansas.), and UP 5526, ex UP 916, C&NW 5072, was the last, completed on 10 November 1997).
6. Originally equipped with Automatic Train Control (ATC) for operation along C&NW lines; equipped during 1981 with cab signals and Automatic Cab Signal equipment for operation along Union Pacific main lines in Nebraska as lead units on pooled C&NW trains to UP's North Platte, Nebraska, yard, so that these trains could operate without a pilot UP unit), using equipment removed from retired UP SD45s and other retired units; both ATC and ACS equipment removed by C&NW during 1992 for use their own new C40-8s.
7. Individual unit histories:

Notes:

1. All seven units were retired, along with the other 40 units, in September and November 2002.UP 5530 was wrecked on 25 October 1997 at West Junction (Houston), Texas, scrapped at wreck site.

General Notes:

1. Total of 30 MP units went to UP at merger, numbered MP 3500-3529.
2. First complete class of former MP locomotives to be repainted to Union Pacific yellow and gray, with Missouri Pacific lettering, completed in June 1984 through February 1985 (MP 3501 was the first, completed on 15 June 1984, and MP 3505 was the last, completed on 21 February 1985).
3. Of the 30 units to UP at merger, 12 units were renumbered to the UP 50-79 group in January through October 1988 (UP 57, ex MP 3507, was the first, completed on 7 January 1988, and UP 50, ex MP 3500, was the last, completed on 18 October 1988).
4. All 30 units were renumbered to the UP 960-989 group in January 1989 through May 1992 (UP 963, ex MP 3503, was the first, completed on 4 January 1989, and UP 981, ex UP 71, MP 3521, was the last, completed on 22 May 1992).
5. Of the 30 units to UP at merger, 29 units remained to be renumbered to the UP 5558-5587 series (UP 967 was retired in 1998); a total of 16 units were renumbered to the 5558-5587 series, including UP 5568, renumbered during August 2000, after the December 1999 assignment of the 1658-1687 series because the UP 1658 was still occupied by a GP15-1.
6. Built without dynamic braking; dynamic braking was added to 10 units (UP 1658-1667, as UP 960-969) by VMV Enterprises, Paducah, Kentucky, in October 1992 through August 1993.
7. Assigned UP 50-79 in December 1985, 12 units renumbered; assigned UP 960-989 in February 1989, all 30 units renumbered; assigned UP 5558-5587 in December 1996, 16 units renumbered; assigned UP 1658-1687 in December 1999.
8. The builder data for UP 1671 has been changed to reflect a photo of the unit's builder plate.
9. Individual unit histories:

Notes:

1. Seven units rebuilt in April to December 2006 as MP 20GP locomotives by Motive Power International using 2000-horsepower Caterpillar diesel engines; renumbered to UPY 2100 series numbers.
2. UP 1658 was rebuilt to UPY 2106, completed on 7 July 2006.
3. UP 1659 was rebuilt to UPY 2108, completed on 25 August 2006.
4. UP 1660 was rebuilt to UPY 2105, completed on 30 June 2006.
5. UP 1664 was rebuilt to UPY 2112, completed on 22 December 2006.
6. UP 1666 was rebuilt to UPY 2111, completed on 27 October 2006 (UP 1666 was retired late on 8 June 2007).
7. UP 1668
8. UP 1670
9. UP 1671
10. UP 1673
11. UP 1674
12. UP 1675
13. UP 1679
14. UP 1681
15. UP 1682
16. UP 1683
17. UP 1684 was rebuilt to UPY 2103, completed on 7 June 2006.
18. UP 1686 was rebuilt to UPY 2104, completed on 13 June 2006.
19. UP 1687

General Notes:

1. Total of three units to UP, numbered UP 1542-1544; leased from Locomotive Lease Partners (LLPX); delivered to UP in March 1997.
2. Built as C&NW 4411, 4412, and 4413 (part of C&NW 4411-4424 group); GMAC lease to C&NW expired on 31 December 1991; all 14 units were retired by C&NW in January 1992 and returned to owner/lessor, GMAC, in March 1992; leased to California Northern Railroad (CFNR) in October 1993; lease to CFNR expired in late 1996 and these three units were leased to UP.
3. Not equipped with dynamic braking.
4. Assigned UPY 542-544 in December 1999; only UP 1542/UP 542 was renumbered.
5. Individual unit histories:

Notes:

1. UP 1543 lease expired on 29 July 2002; returned to owner Locomotive Leasing Partners; in national lease service as LLPX 1515.
2. UP 1544 lease expired on 29 July 2002; returned to owner Locomotive Leasing Partners; in national lease service as LLPX 1513.

General Notes:

1. Original total of 11 C&NW units; 10 units went to UP at merger; C&NW retired 4407 prior to the merger.
2. Equipped with Automatic Train Stop (ATS) for operation along former C&NW Chicago commuter lines.
3. Equipped with Automatic Train Control (ATC) for operation along former C&NW lines.
4. UP 1548 (ex C&NW 4403) was the first unit of this group to be repainted to Union Pacific, completed on 29 April 1997.
5. Not equipped with dynamic braking.
6. Assigned UP 1545-1554 in June 1995, two units (UP 1548, 1554) renumbered; assigned UPY 545-554 in December 1999.
7. Renumbered to UPY 545-554.

General Notes:

1. Total of 20 MP units went to UP at merger, numbered MP 1555-1574; MP 1570-1574 were originally lettered for Chicago & Eastern Illinois (C&EI), the last units to be so lettered prior to that road's being officially merged with parent Missouri Pacific Corp., on 15 October 1976.
2. Of the original 20 units, three units (MP 1560, 1568, 1571) were repainted to UP yellow and gray, with Missouri Pacific lettering, in June through October 1985; relettered to UP in April through July 1989.
3. Renumbered and repainted to UP 1572-1574 in December 1985 through April 1991 (UP 1572, ex MP 1572, was the first, completed on 5 December 1985; UP 1555, ex MP 1555, was the last, completed on 29 April 1991).
4. Not equipped with dynamic braking.
5. Renumbered to UPY 555-574.

General Notes:

1. Total of 140 MP units went to UP at merger, numbered MP 1575-1714.
2. Of the original 140 units, 26 units (MP 1576, 1577, 1580, 1588, 1590, 1595, 1596, 1600, 1619, 1620, 1621, 1628, 1642, 1644, 1645, 1650, 1651, 1655, 1689, 1690, 1693, 1694, 1702, 1706, 1708, 1712) were repainted to UP yellow and gray, with Missouri Pacific lettering, in July 1984 through November 1985; relettered to UP in May 1987 through September 1993.
3. UP 1700-1714 (15 units) are equipped with Automatic Train Stop (ATS) for operation along former C&NW Chicago lines, and Automatic Train Control (ATC) for operation along other former C&NW lines.
4. UP 1654 (ex MP 1654) was the first in this group to be repainted to Union Pacific, completed on 25 November 1985; UP 1685 (ex MP 1685) was the last, completed on 11 October 1993.
5. Not equipped with dynamic braking.
6. Renumbered to UPY 575-714.

General Notes:

1. Total of 30 MP units went to UP at merger, numbered MP 1715-1744.
2. Of the original 30 units, three units (MP 1730, 1739, 1744) were repainted to UP yellow and gray, with Missouri Pacific lettering, in November 1984 through August 1985; relettered to UP in January through July 1993.
3. UP 1715-1739 (25 units) are equipped with Automatic Train Stop (ATS) for operation along former C&NW Chicago commuter lines, and Automatic Train Control (ATC) for operation along other former C&NW lines.
4. UP 1730 (ex MP 1730) was the first in this group to be repainted to Union Pacific, completed on 20 December 1985; UP 1716 (ex MP 1716) was the last, completed on 20 September 1993.
5. Not equipped with dynamic braking.
6. Renumbered to UPY 715-744.

General Notes:

1. Total of 18 MKT units went to UP at merger, numbered MKT 325-335, 337-343 (MKT 336 blank and not used).
2. UP 1990 (ex MKT 333) and UP 1995 (ex MKT 339) were retired by UP; leaving a total of 16 units to be renumbered to 1783-1799 group (six units actually renumbered).
3. Original total of 20 units, built for Illinois Central; to Illinois Central Gulf in 1972; lease to ICG expired and 18 units were leased to MKT in 1985; two ICG units were left out of the lease to MKT: ICG 9510 and ICG 9512; ICG 9510 was purchased by ICG following a March 1975 wreck, and was not transferred to MKT; later sold by ICG in 1994 to New England Central 9510; ICG 9512 (EMD 35677, Feb 1970) was rejected by MKT in original lease from Helm Financial due to poor mechanical condition, leaving the MKT number 336 blank and not used; ICG 9512 was later used by Helm in their national lease fleet as HLCX 9712, then to Chicago, Missouri & Western 2048, then to Gateway Western 2048; ICG 9503 (later MKT 328 and UP 1985) carried ICG's commemorative bicentennial paint scheme as ICG 1776, from June 1975 through September 1976, as replacement to ICG 9510, the original commemorative unit, which carried the special scheme for less than one month, until it was wrecked in March 1975.
4. Purchased by UP on 23 October 1996 upon expiration of original lease to MKT.
5. Built on EMD order number 5747.
6. Assigned UP 1982-1999 in December 1988; assigned UP 1783-1799 in September 1997, six units renumbered; assigned UP 283-299 in December 1999.
7. Individual unit histories:

Notes:

1. UP 1783 (ex UP 1982 and ex MKT 325) was assigned UP 283 in the December 1999 renumbering plan, but that number was used by UP 1982 (ex SP 4856) in April 2004. UP 1783 remains in service as of February 2008.
2. UP 1796 (ex UP 19, ex UP 1996) operated as UP 1996 until 19 March 1996; renumbered to UP 19 to vacate the 1996 number slot for use by a UP 1996 Summer Olympics commemorative SD40-2; renumbered to UP 1796 on 4 April 1997.
3. UP 1796 was sold to National Railway Equipment, en route to NRE-Silvis on 14 March 2002.