Union Pacific Railroad

General Notes:

1. UP 3100 was rebuilt from UP SD24 423 (EMD 25381, Sep 1959) in August 1968 as a prototype for a possible rebuild program for the SD24s, making them similar to the SD40s. The rebuild effort included a constant speed EMD 16-645 3000 horsepower engine (with speed control taking place by changing the level of excitation of the main generator) and traction motors permanently connected in parallel. UP tried many other features, including a variable dynamic braking feature, first used on the small 51-75 single unit turbines. UP 3100 was also the first unit on UP to have the capability of a self-load test, rather than being connected to an external load box. This self load feature was first delivered on UP's DDA40Xs, and on almost all production units from EMD after 1971. The more troublesome test features were soon removed; the constant speed engine only lasted about two years, the traction motors were also connected in a normal fashion at that time. When built, the unit was equipped with fiberglass hood doors, with magnetic latches. The latches were changed to the EMD standard "knuckle buster" design in March 1974 when the unit (as UP 3399) received a new generator in Salt Lake City.
2. UP 3100 (SD24M) rebuilt from UP 423 (SD24) in August 1968; renumbered to UP 3200 in December 1970; renumbered to UP 3399 in March 1972; renumbered to UP 3999 in November 1976; renumbered to UP 99 in October 1978; retired and scrapped in November 1985.

General Notes:

1. Total of two MKT units went to UP at merger, numbered MKT 226 and 227 (equipped in July 1982 as slug control units to operate with MKT road slug 501); renumbered to UP 595, 596 in 1989 (still equipped to operate with road slug S300, ex UP S50, originally MKT 501).
2. Original MKT lease (assumed by UP) expired on 30 June 1995; purchased by UP on 1 July 1995.
3. Not equipped with dynamic braking.
4. Built on EMD order number 7192.
5. Assigned UP 2900 and 2901 in December 1999; changed back to 3000 and 3001 in August 2000.

General Notes:

1. This group of six units were part of a total of 15 WP units went to UP at merger, numbered WP 3545-3559; renumbered to UP 900-905 in February 1984 through November 1988; renumbered to UP 3002-3007 and converted to operate as road slug control units in December 1990 to February 1991.
2. Equipped as road slug control units to operate with road slugs UP S301-S303 (renumbered to UPY 927-929) in local and heavy switching service.
3. Converted to road slug control units by Morrison Knudsen at Boise, Idaho, and operated in the Hinkle, Oregon, area (as both 900 and 3000 series units) pending completion of all six GP40-2 road slug control units and the three road slugs; the road slugs were completed on 29 September 1990; the three 12-motor slug sets (GP40-2/slug/GP40-2) were placed in service in April 1991.
4. These six road slug control units were assigned with the following UPY road slug units: UP 3002/S301/UP 3003; UP 3004/s302/UP 3005; UP 3006/S303/UP 3007.
5. Above six units, as part of original 15-unit group, assigned UP 900-905 and 906-914 in December 1983; six units (UP 900-905) converted to road slug control units and renumbered UP 3002-3007 beginning in December 1990; assigned UP 1535-1540 in December 1999.
6. Individual unit histories:

General Notes:

1. Original total of 135 C&NW units; total of 132 units went to UP at merger; C&NW retired three units (C&NW 6822, 6910, and 6912) prior to the merger.
2. Of the 132 units went to UP, these 84 units are assigned UP 3015-3098; the other 48 units are assigned UP 2952-2999.
3. Equipped with Automatic Train Control (ATC) for operation along former C&NW lines.
4. UP 3051-3098 (ex C&NW 6886-6935 are equipped with UP Coded Cab Signals, received in about 1991 from C&NW's GP50s, which themselves received CCS from UP's retired SD45s; UP's CCS was needed in C&NW locomotives to allow them to lead on UP pool trains between the C&NW connection at Fremont, Nebraska, and UP's large North Platte yard.
5. UP 3055-3087 (ex-C&NW 6890-6924) were purchased by UP on 28 December 2001 upon expiration of the original C&NW lease.
6. UP 3089-3098 (ex C&NW 6926-6935) were purchased by UP on 1 March 1997 after expiration of the original C&NW lease.
7. UP 3037 (ex C&NW 6872) was the first unit in this group to be repainted to Union Pacific, completed on 30 June 1995.

Notes:

1. C&NW 6873 (never renumbered to UP 3038) was sold to Helm Financial in (?), and as of 2004, was in national lease service as HLCX 6238. (Extra 2200 South, Issue 126, page 13)
2. C&NW 6900, 6914, 6925, UP 3064 (ex-C&NW 6899), 3074 (ex-C&NW 6909) were retired on 26 December 2001 upon expiration of their operating lease; purchased and reinstated to the active roster on 28 December 2001 (UP 3064 remains retired as of February 2008).
3. UP 3083 (ex C&NW 6920) sold to Evansville & Western 6002 (frame check, 74661-30, by Joe Ferguson)
4. UP 3085, as C&NW 6922, was painted with C&NW's "Falcon Service" logo in early July 1976.
5. UP 3092 (ex C&NW 6929) was retired in October 2000 and sold to CIT Equipment Finance; in national lease service as CITX 3092.
6. C&NW 6930 (assigned UP 3093) was wrecked on 21 October 2002 at Des Pleaines, Illinois; retired on 19 December 2002. (information from Bill Miller, via email to UP Locomotives discussion group)
7. UP 3098 (ex C&NW 6935) was retired on 27 February 2001; stored until donated to West Chicago Training Center on 5 December 2008.

General Notes:

1. Equipped with Automatic Train Stop (ATS) for operation along former C&NW Chicago commuter lines.
2. Equipped with Automatic Train Control (ATC) for operation along former C&NW lines.
3. UP 3100 was built as UP SD40-2H 8046; renumbered to UP 3316 in September 1981; repainted (after rebuilding in-kind) as 1996 Atlanta Summer Olympic Games commemorative unit and renumbered to 1896 on 7 April 1996; repainted to standard UP yellow and gray and renumbered to UP 3100 on 29 November 1996.
4. UP 3101 operated in trailing-unit-only status (by removal of cab signals, refrigerator, toilet, and cab seats) as UP B3339 from 9 March 1992 to 24 March 1995; repainted (after rebuilding in-kind) as 1996 Atlanta Summer Olympic Games commemorative unit and renumbered to 1996 on 7 April 1996; repainted to standard UP yellow and gray and renumbered to UP 3101 on 20 October 1996.
5. UP 3102 was built as UP SD40-2H 8055; renumbered to UP 3325 in March 1982; renumbered to UP 3102 (after rebuilding in-kind) on 24 February 1998.
6. Assigned 3100-3102 in 1996; three units renumbered; assigned UP 3097-3099 in November 2002 to clear earlier the same 3100-3102 series for use by renumbered 3700 series, 3800 series (ex MKT), and 3900 series (ex MP) SD40-2s, which in turn cleared the 3700-3900 series for use by new SD70M units.
7. Individual unit histories:

General Notes:

1. Equipped with Automatic Train Stop (ATS) for operation along former C&NW Chicago commuter lines.
2. Equipped with Automatic Train Control (ATC) for operation along former C&NW lines.
3. UP 3097 was built as UP SD40-2H 8046; renumbered to UP 3316 in September 1981; repainted (after rebuilding in-kind) as 1996 Atlanta Summer Olympic Games commemorative unit and renumbered to 1896 on 7 April 1996; repainted to standard UP yellow and gray and renumbered to UP 3100 on 29 November 1996; renumbered to UP 3097 on 6 November 2002.
4. UP 3098 operated in trailing-unit-only status (by removal of cab signals, refrigerator, toilet, and cab seats) as UP B3339 from 9 March 1992 to 24 March 1995; repainted (after rebuilding in-kind) as 1996 Atlanta Summer Olympic Games commemorative unit and renumbered to 1996 on 7 April 1996; repainted to standard UP yellow and gray and renumbered to UP 3101 on 20 October 1996; renumbered to UP 3098 on 11 December 2002.
5. UP 3099 was built as UP SD40-2H 8055; renumbered to UP 3325 in March 1982; renumbered to UP 3102 (after rebuilding in-kind) on 24 February 1998; renumbered to UP 3099 on 1 November 2002.
6. Assigned UP 3100-3102 in 1996; three units renumbered; assigned UP 3097-3099 in November 2002 to clear the UP 3100-3102 series for use by renumbered 3700 series, 3800 series (ex MKT), and 3900 series (ex MP) SD40-2s , which in turn cleared the 3700-3900 series for use by new SD70M units.

General Notes:

1. All units are at least the second (2nd) instance of UP using each number on an EMD SD40-2.
2. Most units were renumbered from units in UP's 3700, 3800, and 3900 series in 2002-2004 to clear those number series for use by new SD70M units.
3. Other units renumbered from UP's 7800 and 7900 series numbers to clear those number series for use on new GE C45C-CTE units to be delivered in 2007 and 2008.

Notes:

1. UP 3105 was donated (along with caboose UP 24567) to Railway & Locomotive Historical Society, Southern California Chapter, and moved to Los Angeles County Fairplex in Pomona, California, to replace UP steam 4-8-8-4 4014 as part of the railroad display; the actual move to exchange UP 4014 for UP 3105 and caboose 24567, took place in January 2014.
2. UP 3118 (2nd) was wrecked (sideswipe) during May 2008 in switch service at West Colton, California; scrapped by UP at West Colton, California during mid January 2009.
3. UP 3503 was sold to CIT Equipment Finance Group (CITX) on 27 May 2005 to replace CITX SD40-2 2807, destroyed while in lease service on UP on 3 May 2004 at San Antonio, Texas.