All Time UP Diesel Roster, Miscellaneous units

GE 44 ton — 1 unit
380 horsepower; B-B trucks; 88,600 pounds operating weight

Road Number	First Number	Second Number	Third Number	Builder Date	Builder Number	Date Retired	Notes
UPMW 903999	GE 1399	UP 1399	UPMW 03999	Feb 1947	28344	Jun 1974	1

General Note:

UPMW 903999 was built new as GE demonstrator 1399, delivered to Union Pacific on 28 March 1947; sold to UP on 8 May 1947. UP 1399 renumbered to UPMW 03999 in October 1956; renumbered to UPMW 903999 in December 1959; used at maintenance of way equipment shop at Pocatello, Idaho, from October 1956 until 1972; sent to Omaha for a complete rebuild in late 1972, completed in February 1973; used as Omaha shop switcher until retirement in 1974.

Note:

1.	Sold to Diesel Supply Co., in June 1974; sold to General Dynamics, Electric Boat Division, Groton, Conn., in August 1974, named "Diane"; donated to Danbury Railroad Museum, Danbury, Conn. in about July 2006 (photo)

GE 44 ton — 1 unit
380 horsepower; B-B trucks; 88,600 pounds operating weight

Road Number	First Number	Second Number	Builder Date	Builder Number	Notes
UPMW 03999	GE 1399	UP 1399	Feb 1947	28344	Renumbered to UPMW 903999 in December 1959.

General Note:

UPMW 03999 was built as GE demonstrator 1399, delivered to Union Pacific on 28 March 1947; sold to UP on 8 May 1947. UP 1399 was first assigned to yard switching duties in the Omaha area, then as shop switcher for Omaha Shops; then transferred to the maintenance of way department and renumbered to UPMW 03999 in October 1956; used at the maintenance of way equipment shop at Pocatello, Idaho, from October 1956 until 1972.

Baldwin-Westinghouse 50 ton Electric — 1 unit
400 horsepower; B-B trucks; 95,000 pounds operating weight

Road Number	First Number	Builder Date	Builder Number	Date To UP	Notes
LA&SL E-100	G&M 22	Aug 1923	56397	May 1931	Transferred to UP-owned Yakima Valley Transportation Co., 297, Yakima, Wash., in March 1942; donated to Orange Empire Trolley Museum, Perris, Calif., in November 1985.

General Notes:

a.	LA&SL/UP E-100 built new as Glendale & Montrose Railway 22; locomotive and railroad sold to UP in May 1931.
b.	LA&SL/UP E-100 was equipped with 36-inch wheels; 60:17 gear ratio, and four Westinghouse Model 562-D5, 100 horsepower traction motors.
c.	LA&SL/UP class B-1.
d.	LA&SL/UP E-100 had Baldwin-Westinghouse order nnumber 23577.

Maintenance of Way Locomotives — 8 units
Two-axle, four-wheel

Road Number	First Number	Type	Weight	Builder	Builder Model	Builder Date	Builder Number	Date Retired	Notes
UP-1		G-M	12 ton	Vulcan		Dec 1922	3273	1950	1
UP-2		G-M	12 ton	Vulcan		Dec 1922	3274	1936	2
UP-3		G-M	12 ton	Whitcomb	WHL	May 1929	12889	1950	3
UP-4		D-M	12 ton	Davenport	D-12	May 1931	2190	1938	4
UP-5		G-M	20 ton	Whitcomb	20GM-4	Oct 1936	13150		5

MW-1	MW-6	D-M	25 ton	Whitcomb	25DM-42A	Jun 1950	40693		6
MW-2	MW-8	D-E	25 ton	GE		Jun 1967	35916		7
MW-3	UP-5	G-M	20 ton	Whitcomb	20GM-4	Oct 1936	13150	1968	8
MW-4		D-M	24 ton	Whitcomb	20GM-9	Oct 1937	13162		9
MW-6		D-M	25 ton	Whitcomb	25DM-42A	Jun 1950	40693		10
MW-7		D-M	25 ton	Whitcomb	25DM-42A	Jun 1950	40694		11
MW-8		D-E	25 ton	GE		Jun 1967	35916		12
		D-M	30 ton	Whitcomb	30DM35A	Sep 1944	40288	24 Feb 1978	13

General Notes:

a.	G-M denotes Gas-Mechanical; D-M denotes Diesel-Mechanical; D-E denotes Diesel-Electric.
b.	Union Pacific used the term Roadway Service for all of its maintenance of way equipment and activities.
c.	UP-1 to UP-5 and MW-1 to MW-8 were 29-1/2 inch gauge and were used at UP's tie plants in Laramie, Wyo., and The Dalles, Ore.

Notes:

1.	UP-1 was retired in 1950 under Work Order 6114; UP records show replaced by MW-1.
2.	UP-2 was retired in 1936 under Work Order 1278.
3.	UP-3 had 97 horsepower; retired in 1950 under Work Order 7947; UP records show replaced by MW-7.
4.	UP-4 was retired in 1938 under Work Order 5788; UP records show replaced by MW-4.
5.	UP-5 renumbered to MW-3.
6.	MW-1 had 190 horsepower; renumbered from MW-6; still in service during November 1978.
7.	MW-2 was renumbered from MW-8; still in service during November 1978; sold to Kerr McGee, number KM-2D.
8.	MW-3 renumbered from UP-5; retired 1968 under Work Order 31009.
9.	MW-4 had 147 horsepower; was still in service during November 1978.
10.	MW-6 had 190 horsepower; renumbered to MW-1.
11.	MW-7 had 190 horsepower; still in service, November 1978; sold to Kerr McGee, number KM-1D.
12.	MW-8 renumbered to MW-2.
13.	(No MW Number) 140 horsepower; purchased second-hand from Boeing Aircraft Co.; used briefly as shop switcher at North Platte; transferred to Roadway equipment shop in Pocatello, Idaho; removed from service in 1976; retired on 24 February 1978 and sold.