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Demonstrators Owned By Union Pacifc

Compiled by Don Strack

This page was last updated on April 27, 2011.

Based on a handwritten original from 1972.

Road
Number
Demonstrator
Road Number
Builder
Model
Builder
Date
Date
To UP
Notes
UP 50 GE 101 GTEL Nov 1948 Jun 1949 4500 horsepower Gas Turbine Electric locomotive. Double cab. Returned to GE in March 1951.
UP 72B, 73B EMD 5653, 5655 DD35 Sep 1963 May 1964 B-units of the GP35/DD35/GP35/GP35 demonstrator set; painted red and white.
UP 445-447 EMD 7200-7202 SD24 Aug 1960 Aug 1961 Painted in SP "Bloody Nose" gray and red scheme; first operated on SP.
UP 448 EMD 5579 SD24 Jul 1958 Sep 1962 First SD24 built (see photo in Our GM Scrapbook for original, as-built configuration); rebuilt to production SD24 configuration in August 1960 and repainted to a different demonstrator paint scheme.
UP 620, 621 GE 750A, 750D UM20B Sep 1954 Apr 1960 First operated on Erie Railroad, painted in Erie colors. GE 750A was equipped with an 8 cylinder 1200 horsepower engine; GE 750D was equipped with a 12 cylinder 1800 horsepower engine; both units rebuilt by GE in October 1959 with 12 cylinder 2000 horsepower engines.
UP 620B, 621B GE 750B, 750C UM20B Sep 1954 Apr 1960 First operated on Erie Railroad, painted in Erie colors. GE 750B was equipped with an 8 cylinder 1200 horsepower engine; GE 750C was equipped with a 12 cylinder 1800 horsepower engine; both units rebuilt by GE in October 1959 with 12 cylinder 2000 horsepower engines. Retired in October 1963.
UP 633-636 GE 2501-2504 U25B Feb 1962 Jul 1962 UP 633/GE 2501 was equipped with low short hood, other three units equipped with high short hood. All 4 units retired in September 1972.
UP 650, 651   Erie A Dec 1945 May 1946 Delivered to UP as 50M-1A, 50M-2A; renumbered to UP 981, 982 in August 1946; renumbered to UP 700, 701 in March 1948; renumbered to 650, 651 in February 1953. Retired in August and May 1961.
UP 650B   Erie B Dec 1945 May 1946 Delivered to UP as 50M-3B; renumbered to UP 983B in August 1946; renumbered to UP 700B in March 1948; renumbered to 650B in February 1953. Retired in July 1961.
UP 675-678 ALCO 640-2 to 5 DL640 Dec 1959 Sep 1961 Retired in 1970 and 1971.
UP 762, 763 EMD 5652, 5654 GP35 Jul 1963 May 1964 Lead units of the GP35/DD35/GP35/GP35 demonstrator set; painted red and white.
UP 875 EMD 5629, 1962 GP30 Jun 1961 Sep 1962 Built as GP22 number 5629, operated in UP yellow and gray (see photo in Trains, February 1962, p.9); rebuilt to GP30 number 1962, operated in EMD demonstrator paint scheme.
UP 1000 EMD 889 NW2 Oct 1939 Dec 1939 Operated on UP from built date to purchase date. Retired in 1966.
UP 1250 BLW 1500 DRS-6-4-15 Sep 1946 Jan 1948 Retired in August 1962.
UP 1290 ALCo 1190 RSC-2 Nov 1947 Mar 1948 Operated as ALCo 1190; renumbered to UP 1190; renumbered to 1290 in October 1955. Retired in June 1968.
UP 1366 FM 2000 H20-44 Aug 1947 Oct 1947 Retired in November 1962.
UP 1481, 1482 EMD 459A, 459D F7A Oct 1952 Dec 1952 Operated as demonstrators on Norfolk and Western. Retired in May and January 1963.
UP 1496B, 1496C EMD 459B, 459C F7B Oct 1952 Dec 1952 Operated as demonstrators on Norfolk and Western. Retired in December 1962 and January 1963.
UP 1483 EMD 5040 F7A Jul 1950 Jan 1953 Retired.in June 1964.
UP 3040-3047 EMD 434A to H SD40X Feb 1965 Dec 1966 Built as test bed locomotives for EMD's then-new 645 engine. Operated in an all-black paint scheme with unit nujbers in white on the cab sides. EMD 434A, 434B operated in Canada as GMDL 7001, 7002; EMD 434c, 434D operated in Mexico; all four units returned to U. S. in December 1966.
UP 5001 GE 5001 U50C Oct 1969 Nov 1969 Operated in tests for GE on the Erie Lackawana in a gray paint scheme with unit number in black on the cab sides (see photo in Second Diesel Spotters Guide, p.GE-184)
UP 903999 GE 1399 44 ton Mar 1947 Apr 1947 Painted in UP yellow and gray. Operated as shop switcher at System Roadway Equipment Shop in Pocatello, Idaho.

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