Union Pacific Steam Locomotives, 1915-1962

General Notes:

1. Seven OSL 2500 series 2-8-2s were sent to LA&SL in 1923, as LA&SL 2700 series locomotives. These seven engines did not have stokers and were immediately converted to oil by LA&SL.
2. OSL 2506, 2507, 2511, 2512 were equipped with Duplex stokers
3. Some OSL 2500 class 2-8-2s had higher boiler pressure, allowing 53,628 pounds tractive effort

Notes:

1. OSL 2500 was built as OSL 1200 in 1913; to OSL 2500 in 1915; to LA&SL 2726 in 1923; vacated in 1956
2. OSL 2501 was built as OSL 1201 in 1913; to OSL 2501 in 1915; to LA&SL 2727 in 1923; vacated in 1948
3. OSL 2502 was built as OSL 1202 in 1913; to OSL 2502 in 1915; to LA&SL 2728 in 1923; vacated in 1956
4. OSL 2503 was built as OSL 1203 in 1913; to OSL 2503 in 1915; to LA&SL 2729 in 1923; vacated in 1948
5. OSL 2504 was built as OSL 1204 in 1913; to OSL 2504 in 1915; vacated in 1954
6. OSL 2505 was built as OSL 1205 in 1913; to OSL 2505 in 1915; to LA&SL 2730 in 1923; vacated in 1956
7. OSL 2506 was built as OSL 1206 in 1913; to OSL 2506 in 1915; vacated in 1949
8. OSL 2507 was built as OSL 1207 in 1913; to OSL 2507 in 1915; vacated in 1952
9. OSL 2508 was built as OSL 1208 in 1913; to OSL 2508 in 1915; vacated in 1947
10. OSL 2509 was built as OSL 1209 in 1913; to OSL 2509 in 1915; to LA&SL 2731 in 1923; vacated in 1957
11. OSL 2510 was built as OSL 1210 in 1913; to OSL 2510 in 1915; vacated in 1956
12. OSL 2511 was built as OSL 1211 in 1913; to OSL 2511 in 1915; vacated in 1954
13. OSL 2512 was built as OSL 1212 in 1913; to OSL 2512 in 1915; vacated in 1947
14. OSL 2513 was built as OSL 1213 in 1913; to OSL 2513 in 1915; vacated in 1948
15. OSL 2514 was built as OSL 1214 in 1913; to OSL 2514 in 1915; to LA&SL 2732 in 1923; sold to Six Companies in September 1932 for use in the construction of Boulder Dam; sold back to UP in March 1936; vacated in 1947

General Notes:

1. Seven OSL 2515 series 2-8-2s were sent to LA&SL in July 1918, as LA&SL 3700 series locomotives, later becoming LA&SL 2700 series.
2. Three OSL 2515 series 2-8-2s were sent to LA&SL in 1923, as LA&SL 2700 series locomotives.
3. Some OSL 2500 class 2-8-2s had higher boiler pressure, allowing 53,628 pounds tractive effort

General Notes:

1. Ten OSL 2525 series 2-8-2s were sent to UP in 1923, as UP 2300 series locomotives.
2. OSL 2525- 2534 were equipped with Street stokers
3. Some OSL 2500 class 2-8-2s had higher boiler pressure, allowing 53,628 pounds tractive effort

General Notes:

1. OSL 2515-2518 were built as UP 714-718 in 1912; renumbered to UP 2214-2218 in 1915-1916; sent to OSL in 1923 and renumbered to OSL 2515-2518.
2. OSL 2516, 2518 were equipped with Duplex stokers.

General Notes:

1. OSL 2519-2524 were built as UP 720-741 in 1913; renumbered to UP 2220-2241 in 1915-1916; sold to OSL in 1923 and renumbered to OSL 2519-2524.
2. In 1923 OSL traded ten locomotives (OSL 2525-2534) in the MK-8 class to UP for 18 UP locomotives in the MK-4, MK-5, MK-6, and MK-7 classes.
3. OSL 2519, 2522, 2523. 2524 were equipped with Duplex stokers.

General Notes:

1. OSL 2525-2527 were built as UP 746-758 in 1914; renumbered to UP 2246-2258 in 1915-1916; sold to OSL in 1923 and renumbered to OSL 2525-2527.
2. In 1923 OSL traded ten locomotives (OSL 2525-2534) in the MK-8 class to UP for 18 UP locomotives in the MK-4, MK-5, MK-6, and MK-7 classes.
3. OSL 2526, 2527 were equipped with Duplex stokers.

General Notes:

1. OSL 2528-2532 were built as UP 2266-2278 in 1917; sold to OSL in 1923 and renumbered to OSL 2528-2532.
2. In 1923 OSL traded ten locomotives (OSL 2525-2534) in the MK-8 class to UP for 18 UP locomotives in the MK-4, MK-5, MK-6, and MK-7 classes.
3. OSL 2531, 2532 were equipped with Duplex stokers.

General Notes:

1. OSL 2535-2554 were equipped with Duplex stokers

Notes:

1. OSL 2536 and 2538 were wrecked on 12 February 1946 at Bickel, Idaho
2. OSL 2537 was donated to Walla Walla, Washington; delivered to Walla Walla on December 22, 1959. The engine had been out of service since 1956 and was retired by UP in July 1959. (Spokane Spokesman newspaper, December 23, 1959)

General Notes:

1. OSL 2555-2564 were built as LA&SL 3716-3725 in 1921; renumbered to LA&SL 2716-2725 in (?); sold to OSL in 1923 and numbered as OSL 2555-2564
2. In 1923 LA&SL traded ten MK-10 locomotives (LA&SL 2716-2725) to OSL in return for ten OSL 2500 series locomotives in the OSL 2500-2521 group; the ten LA&SL locomotives were renumbered as OSL 2555-2564.
3. In 1923 OSL traded ten 2500 series locomotives to LA&SL for the above ten LA&SL 2700 series locomotives.
4. OSL 2555-2564 were equipped with Duplex stokers
5. Some OSL 2500 class 2-8-2s had higher boiler pressure, allowing 53,628 pounds tractive effort

Notes:

1. OSL 2564 donated to Mojave Foundation, Oro Grande, California; to Orange Empire Railway Museum, Perris, California, in 1996; moved to Perris in July 1997.

Notes:

1. LA&SL 2701 and 2707 were sold to Six Companies in September 1932 for use in the construction of Boulder Dam; LA&SL 2707 was sold back to UP in March 1936

General Notes:

1. In June 1920 OSL traded seven 2515 series locomotives to LA&SL for six LA&SL 3800 series 2-10-2 locomotives, which became OSL 5300-5305; the former OSL 2515 series were renumbered to the LA&SL 3700 series, and renumbered again to the LA&SL 2700 series.

General Notes:

1. In 1923 LA&SL traded ten 2700 series locomotives in the LA&SL 2716-2725 group to OSL in return for ten OSL 2500 series locomotives in the OSL 2500-2521 group; the ten OSL locomotives were renumbered as LA&SL 2726-2735.

General Notes:

1. LA&SL 2726-2732 were built as OSL 1220-1214 in 1913; renumbered to OSL 2500-2514 in 1915-1916; sold to LA&SL in 1923 and renumbered to LA&SL 2726-2732. All seven engines were built as coal-fired without stokers. LA&SL immediately converted all seven to oil-fired.
2. In 1923 LA&SL traded ten 2700 series locomotives in the LA&SL 2716-2725 group, with coal stokers, to OSL in return for ten OSL 2500 series locomotives, without stokers, in the OSL 2500-2521 group; the ten OSL locomotives were renumbered as LA&SL 2726-2735.

Notes:

1. LA&SL 2726 was built as OSL 1200 in 1913; to OSL 2500 in 1915; to LA&SL 2726 in 1923; vacated in 1956
2. LA&SL 2727 was built as OSL 1201 in 1913; to OSL 2501 in 1915; to LA&SL 2727 in 1923; vacated in 1948
3. LA&SL 2728 was built as OSL 1202 in 1913; to OSL 2502 in 1915; to LA&SL 2728 in 1923; vacated in 1956
4. LA&SL 2729 was built as OSL 1203 in 1913; to OSL 2503 in 1915; to LA&SL 2729 in 1923; vacated in 1948
5. LA&SL 2730 was built as OSL 1205 in 1913; to OSL 2505 in 1915; to LA&SL 2730 in 1923; vacated in 1956
6. LA&SL 2731 was built as OSL 1209 in 1913; to OSL 2509 in 1915; to LA&SL 2731 in 1923; vacated in 1957
7. LA&SL 2732 was built as OSL 1214 in 1913; to OSL 2514 in 1915; to LA&SL 2732 in 1923; sold to Six Companies in September 1932 for use in the construction of Boulder Dam; sold back to UP in March 1936; vacated in 1947

General Notes:

1. LA&SL 2733-2725 were built as OSL 2517-2521; sold to LA&SL in 1923 and renumbered to LA&SL 2733-2735.
2. In 1923 LA&SL traded ten 2700 series locomotives in the LA&SL 2716-2725 group to OSL in return for ten OSL 2500 series locomotives in the OSL 2500-2521 group; the ten OSL locomotives were renumbered as LA&SL 2726-2735.