Union Pacific Steam Locomotives, 1915-1962

General Notes:

1. Simple Articulated Consolidation (SA-C)
2. Built as compound locomotives in 1918; rebuilt to simple locomotives in 1942-1944 (including changing drivers from 57 inches to 59 inches) and renumbered to UP 3500 series
3. UP 3600-3614 built as coal burners; five locomotives (UP 3601-3604, 3606, 3608, 3613) converted to oil burners after 1932 and before 1938
4. Oil burners converted back to coal burners in November 1947 through January 1948; assigned to coal branches in the Rock Springs, Wyoming area

General Notes:

1. Simple Articulated Consolidation (SA-C)
2. Built as compound locomotives in 1920; rebuilt to simple locomotives in 1937-1943 (including changing drivers from 57 inches to 59 inches) and renumbered to UP 3500 series
3. UP 3520-3529 (10 locomotives) were leased to OWRR&N in 1920
4. UP 3530-3533 (4 locomotives) were leased to OSL in 1920
5. UP 3620-3632 (13 locomotives) were converted from coal burners to oil burners before 1938

General Notes:

1. Simple Articulated Consolidation (SA-C)
2. Built as compound locomotives in 1923; rebuilt to simple locomotives in 1937-1943 (including changing drivers from 57 inches to 59 inches) and renumbered to UP 3500 series
3. Four locomotives (UP 3535-3538) were converted from coal burners to oil burners before July 1938
4. Oil burners converted to coal burners in November 1947 through January 1948; assigned to coal branches in the Rock Springs, Wyoming area

General Notes:

1. Simple Articulated Consolidation (SA-C)
2. Built as compound locomotives in 1923; rebuilt to simple locomotives in 1937-1943 (including changing drivers from 57 inches to 59 inches) and renumbered to UP 3500 series
3. UP 3642 was equipped with a tender traction booster removed from an OWRR&N 9700 class 4-12-2
4. All five locomtives converted from coal burners to oil burners before 1938
5. UP 3540 was converted from an oil burner to a coal burner in November 1947 through January 1948; assigned to coal branches in the Rock Springs, Wyoming area

General Notes:

1. Simple Articulated Consolidation (SA-C)
2. UP 3544 was built as OSL 3703 in 1918; to UP 3644 in 1923; converted to simple and renumbered to UP 3544 in 1942; vacated in 1954
3. Built as coal burner (as OSL 3703, as UP 3644, and as UP 3544); converted to oil burner in 1943-1945; converted to coal burner in November 1947 to January 1948 and assigned to Rock Springs coal runs.

General Notes:

1. Simple Articulated Consolidation (SA-C)
2. Built as compound locomotives in 1924; rebuilt to simple locomotives in 1937-1943 (including changing drivers from 57 inches to 59 inches) and renumbered to UP 3500 series
3. Eight locomotives (UP 3648, 3649, 3651-3654, 3661, 3664) were converted to oil burners before 1938; remaining 12 locomotives converted to oil burners as 3500 series, after conversion to simple
4. Seven locomotives (UP 3648, 3649, 3651-3654, 3664) were equipped with a tender traction booster removed from an OWRR&N 9700 class 4-12-2s

General Notes:

1. Simple Articulated Consolidation (SA-C)
2. Built as compound locomotives in 1923; rebuilt to simple locomotives in 1937-1943 (including changing drivers from 57 inches to 59 inches) and renumbered to UP 3500 series
3. OSL 3565 and 3566 were converted from coal burners to oil burners before July 1938

General Notes:

1. Simple Articulated Consolidation (SA-C)
2. Built as compound locomotives in 1923; rebuilt to simple locomotives in 1944 (including changing drivers from 57 inches to 59 inches) and renumbered to OWRR&N 3500 series
3. Built as coal burners; converted to oil burners before 1938

General Notes:

1. These 19 locomotives were purchased by UP from C&O in 1945 to help move wartime traffic across Wyoming; vacated and scrapped in 1947 as soon as traffic slowed down.
2. UP retained the tenders from all 30 ex C&O locomotives, designating them as four different tender classes depending on each tender's capacity: 21-RC (10 tenders); 21-RD (3 tenders); 23-RD (6 tenders); and 25-RC (11 tenders). Of the 30 tenders, 14 were sold directly to SP, nine were later scrapped, two were converted for use as water storage; two were assigned to new rotary snow plows, two were rebuilt to a auxiliary steam generator cars, and one was converted for use as fuel storage.

Notes:

1. The tender from UP 3572 was later assigned to rotary snow plow 076 upon its delivery in January 1950; later numbered as UP 900076.
2. The tender from UP 3578 was rebuilt as Auxiliary Steam Generator Car B-1.

General Notes:

1. These 11 locomotives were purchased by UP from C&O in 1945 to help move wartime traffic across Wyoming; vacated and scrapped as soon as traffic slowed down.
2. UP retained the tenders from all 30 ex C&O locomotives, designating them as four different tender classes depending on each tender's capacity: 21-RC (10 tenders); 21-RD (3 tenders); 23-RD (6 tenders); and 25-RC (11 tenders). Of the 30 tenders, 14 were sold directly to SP, nine were later scrapped, two were converted for use as water storage; two were assigned to new rotary snow plows, two were rebuilt to a auxiliary steam generator cars, and one was converted for use as fuel storage.

Notes:

1. The tender from UP 3589 was rebuilt as Auxiliary Steam Generator Car B-2.
2. The tender from UP 3592 was later assigned to rotary snow plow 075 upon its delivery in January 1950; later numbered as UP 900075.