Union Pacific Railroad

General Notes:

1. The UP model designation for these locomotives is SD90AC; EMD uses SD90MAC-H.
2. All 21 units equipped with Locotrol III for distributed power service, also known as DPU.
3. Renumbered from UP 8501-8521, beginning with UP 8514/8924 on 3 May 2005.
4. Formal ownership passed to UP at sometime between 2006 and the units' June 2008 retirement.
5. Following retirement, all 21 units stored at Denver, Colorado, until early August 2008; moved in groups of two or three units to Metro East Industries (MEI) in East St. Louis, Illinois, for removal of usable parts and scrapping of remaining hulks.
6. Individual unit histories:

Notes:

1. UP 8501 was built as UP 8201 in October 1996 and delivered for functional testing to AAR's test track near Pueblo, Colorado; moved to VMV for upgrade during July 1998; released from VMV on 10 October 1998; renumbered to UP 8911.
2. UP 8504 operated from March 1997 through January 1998 as EMDX 8204, then as EMDX 8504 until September 1998, painted in a special paint scheme to commemorate EMD's 75th anniversary; moved to VMV for upgrade during May 1998; released from VMV in full UP yellow and gray on 26 September 1998; renumbered to UP 8914.
3. UP 8924, as UP 8514, was held by EMD for engineering tests until delivered to UP on 6 July 2000.

General Notes:

1. All 73 units were renumbered (or assigned new numbers) from B-numbered units in UP 4115-4163 and 4202-4321 groups; converted to trailing-unit-only status (by removal of refrigerator, toilet, and cab seats) in June through December 1992; other units, without B-numbers, were renumbered to UP 9882-9950 group.
2. Individual unit histories:

Notes:

1. UP B4116 was rebuilt to SD38-2 by UP for yard switch service and renumbered to UPY 856, completed on 7 June 2000.
2. UP 8932, as UP B4124, was renumbered back to UP 4124 on 26 June 1997; returned to trailing-unit-only status as UP B4124 on 31 August 1999.
3. UP 8934 was rebuilt to SD38-2 by UP for yard switch service and renumbered to UPY 862 on 29 May 2003.
4. UP 8943, as UP 4205, operated in trailing-unit-only status as UP B4205 from 1 December 1992 to 7 October 1997.
5. UP 8943 was the first unit in this group to be renumbered, completed on 10 May 2000.
6. UP 8946 was retired and renumbered to UP 7903 (Peak Power) on 5 December 2003.
7. UP 8953 was retired and renumbered to UP 7908 (Peak Power) on 23 December 2003.
8. UP 8959 was rebuilt to SD38-2 by UP for yard switch service and renumbered to UPY 861 on 13 December 2002.
9. UP B4273 was retired on 18 April 2000; still on property and renumbered to UP 8974 on 28 November 2000.
10. UP 8991 was rebuilt to SD38-2 by UP for yard switch service and renumbered to UPY 865 on 28 December 2004.

General Notes:

1. UP 9000 first operated as a test unit at the EMD plant in October 1977; operated as EMD demonstrator (GMCX 9000) on D&RGW in February and March 1978, en route to Leadville, Colorado, on BN subsidiary Colorado & Southern for high altitude testing; photographed with EMD test cars on AT&SF at Barstow, California, on May 7, 1978; UP 9000 was delivered to UP on 16 July 1978, after the other five units. UP records showed a build date for UP 9000 as 15 July 1978.
2. UP 9002 had an initial air-equipment date of February 28, 1978.
3. Equipped with special high adhension HT-B trucks.
4. Initial per unit cost for UP 9000-9005, according to Equipment Trust No. 1 of 1978, dated September 1, 1977, was $502,400, with a total cost of $3,014,400 for all six units. As comparison, the 29 SD40-2s purchased under the same trust, UP 3410-3438, cost $609,425 each.
5. All six units had a bolster centerline of 34 feet, 10-3/4 inches; the trucks had a wheelbase of 117-1/2 inches; the noses were EMD's 88 inches long version.
6. All six units were rebuilt by UP using some GP50 components in October and November 1981; the original 42-inch wheels were replaced with standard 40-inch wheels by late 1984.
7. Built as UP 9000-9005, renumbered to UP 90-95 in May and June 1985; renumbered to UP 954-959 in January 1989 through January 1990, UP 956 retired in November 1997; assigned UP 5500-5505 in 1997, two units renumbered in June and November 1997; assigned UP 9994-9998 in December 1999, none renumbered prior to retirement of five remaining units in May and June 2001.

General Notes:

1. Total of 42 C&NW units to UP at merger, numbered C&NW 8501-8542; renumbered from C&NW to UP not in C&NW sequence due to different mechanical configuration, and different ownership and lease arrangements.
2. Equipped with Automatic Train Control (ATC) for operation along former C&NW lines.

General Notes:

1. Total of 35 C&NW units to UP at merger, numbered C&NW 8543-8577; renumbered from C&NW to UP not in C&NW sequence due to different mechanical configuration, and different ownership and lease arrangements.
2. Equipped with Automatic Train Control (ATC) for operation along former C&NW lines.
3. UP 9087-9089, as C&NW 8575-8577, were painted with C&NW's Mechanical Department Safety and Reliability slogan and logo on each side of the carbody.

Notes:

1. UP 9087 (ex C&NW 8575) was the last unit of this group to be renumbered (patched) to its UP number, completed on 12 May 2006.
2. UP 9096 (ex C&NW 8548) was the first unit of this group to be repainted to Union Pacific, completed on 10 October 1995.