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| | All Time UP Diesel Roster, Part 8 (Site not responding. Last check: 2007-10-29) |
 | | UP 633-636 were built as GE demonstrators 2501, 2503, 2502, 2504, with original builder's date of February 1962; sold to UP in mid July 1962. |
 | | UP 635 was rebuilt to MK 5301 (MK model TE53-4E), completed on 18 August 1975; used by Morrison Knudsen on Black Mesa and Lake Powell Railroad, Page, Ariz.; sold to Black Mesa and Lake Powell, 8 January 1977. |
 | | MP 635 was leased to NdeM in November 1989 to May 1990; returned to UP and stored unserviceable; scrapped by UP at Laredo, Tex., in November 1991; frame only sold for scrap to Southwest Railroad Car Parts, Longview, Tex., in February 1992. |
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