Union Pacific Railroad
Timeline of Motive Power, 1915-1933
This page was last updated on January 16, 2023.
(Return to UP Steam Roster Index Page)
(No attempt has been made to determine a start-of-year total of the locomotive fleet for the years from 1915 to 1926 due to incomplete records of retirements, and incomplete records of the 1915 renumbering.)
1915
On March 1, 1915, Union Pacific put into effect a "Systemwide Numbering Plan" that would essentially renumber almost every locomotive, freight car, passenger car, and caboose owned by the railroad and its several subsidiaries.
The locomotives shown below may or may not have actually been renumbered from their previous numbers, shown in parentheses (xxxx), to their newly assigned-in-1915 numbers. Records are incomplete.
Many of the 4-6-0s shown were in their pre-1915 numbers. Of the 96 locomotives in the 900- and 1000-series, only 17 remained in service after 1915 to receive their new 1200-series numbers. Records are incomplete.
| Added (0) | |||
| Retired (13) | 4 | 0-6-0 | UP 4304 (1106), 4313 (1158), 4316 (1162), 4335 (1184) |
| 1 | 2-8-0 | OWRR&N 162 (Sold) | |
| 1 | 4-4-0 | OWRR&N 59 (Sold) | |
| 7 | 4-6-0 | UP 934, 985, 988 (1212), 1033, 1220 (1400), 1404, 1439 |
1916
| Added (10) | 10 | 0-6-0 | UP 4421-4430 |
| Retired (16) | 9 | 0-6-0 | UP 4300, 4301, 4302, 4303, 4305, 4307, 4317, 4328, 4333 |
| 2 | 2-8-0 | UP 140, 142 | |
| 4 | 4-4-0 | UP 911, 936, 1000, 1001 |
1917
| Added (40) | 30 | 2-8-2 | UP 2260-2265, 2267, 2269-2274, 2276, 2279, 2528-2532, 2709-2715, 2733-2735 |
| 10 | 2-10-2 | UP 5000-5009 | |
| Retired (6) | 2 | 0-6-0 | UP 4320, 4321 |
| 3 | 2-8-0 | UP 500, 501, 502 | |
| 1 | 4-4-0 | UP 1002 |
UP 2-8-8-2s 3600-3602 were sold to OSL in 1917; assigned as helper locomotives on Kings Hill eastbound out of Glenns Ferry, Idaho.
1918
| Added (113) | 20 | 0-6-0 | UP 4431-4450 |
| 10 | 0-6-0 | UP 4600-4609 (USRA pattern) | |
| 5 | 0-6-0 | OSL 4748-4752 | |
| 56 | 2-8-2 | UP 2166-2171, 2280-2294, 2311-2320, 2480-2499, 2535-2539 | |
| 6 | 2-10-2 | LA&SL 3800-3805 (to OSL 5300-5305 within a year) | |
| 16 | 2-8-8-0 | UP 3600-3614, OSL 3703 | |
| Retired (7) | 3 | 0-6-0 | UP 4311, 4315, 4334 |
| 4 | 4-4-0 | UP 912, 913, 917, 925 |
Seven OSL 2500 series 2-8-2s were transferred to LA&SL as LA&SL 3700 series, later LA&SL 2700 series
Seven LA&SL 3700 series 2-8-2s were transferred to OSL as OSL 2500 series
One OSL 3700 series 2-8-8-0 was transferred to UP as a UP 3600 series
1919
| Added (32) | 5 | 0-6-0 | UP 4753-4757 |
| 15 | 2-8-2 | UP 2540-2554 | |
| 7 | 4-6-2 | UP 3134-3138, 3226, 3227 | |
| 5 | 2-10-2 | UP 5010-5014 | |
| Retired (1) | 1 | 4-4-0 | UP 907 |
1920
| Added (100) | 30 | 0-6-0 | UP 4451-4480 |
| 16 | 2-8-2 | UP 2295-2310 | |
| 10 | 4-6-2 | UP 2900-2909 | |
| 25 | 2-10-2 | UP 5015-5039 | |
| 19 | 2-8-8-0 | UP 3615-3633 | |
| Retired (1) | 1 | 4-6-0 | UP 1705 |
UP 4451-4460 (USRA 0-6-0) renumbered to UP 4600-4609 to clear the 4400 series for additional CS pattern 0-6-0s
Six LA&SL 3800 series 2-10-2s were transferred to OSL as OSL 5300 series
1921
These 0-6-0s and 2-8-2s delivered in 1921 were the last to use the Harriman-era CS Classifications.
| Added (14) | 4 | 0-6-0 | UP 4243-4246 (built as LA&SL 40-43) (CS Class S-6) |
| 10 | 2-8-2 | UP 2555-2564 (CS-Class MK-10) | |
| Retired (56) | 8 | 0-6-0 | UP 4310, 4312, 4319, 4325, 4330, 4331, 4336, 4337 |
| 6 | 2-8-0 | UP 131, 132, 134, 135, 136, 141 | |
| 15 | 4-4-0 | UP 900, 903, 918, 922, 924, 927, 929, 930, 1005, 1007, 1010, 1102, 1103, 1108, 1111 |
|
| 13 | 4-4-2 | UP 3321, 3322, 3323, 3324, 3325, 3326, 3327, 3328, 3329, 3330, 3331, 3332, 3333 |
|
| 14 | 4-6-0 | UP 1231, 1238, 1320, 1344, 1346, 1348, 1349, 1351, 1352, 1358, 1501, 1702, 1706, 1708 |
1922
| Added (42) | 2 | 2-10-2 | UP 5400, 5401 |
| 40 | 4-8-2 | UP 7000-7039 | |
| Retired (28) | 5 | 0-6-0 | UP 4306, 4314, 4326, 4329, 4332 |
| 1 | 2-8-0 | UP 137 | |
| 17 | 4-4-0 | UP 905, 909, 916, 1003, 1009, 1011, 1012, 1052, 1053, 1054, 1055, 1056, 1057, 1058, 1059, 1060, 1061 |
|
| 5 | 4-6-0 | UP 1304, 1308, 1500, 1516, 1521 |
1923
| Added (116) | 15 | 4-8-2 | UP 7850-7864 |
| 86 | 2-10-2 | UP 5040-5089, 5306-5318, 5402-5408, 5410, 5414, 5500-5514 | |
| 15 | 2-8-8-0 | UP 3634-3643, OSL 3704, 3705, OWRR&N 3803-3805 | |
| Retired (72) | 3 | 0-6-0 | UP 4318, 4322, 4327 |
| 1 | 2-8-0 | UP 138 | |
| 16 | 4-4-0 | UP 901, 902, 908, 910, 915, 920, 934, 938, 939, 944, 946, 1004, 1006, 1008, 1013, 1014 |
|
| 17 | 4-4-2 | UP 3302, 3303, 3304, 3305, 3306, 3307, 3308, 3309, 3310, 3311, 3313, 3314, 3315, 3316, 3317, 3320, 3334 |
|
| 35 | 4-6-0 | UP 1202, 1205, 1206, 1209, 1210, 1227, 1241, 1302, 1305, 1307, 1310, 1312, 1313, 1316, 1325, 1327, 1331, 1337, 1340, 1341, 1342, 1347, 1350, 1353, 1354, 1355, 1356, 1359, 1513, 1514, 1540, 1541, 1545, 1554, 1736 |
Eighteen UP 2200 series 2-8-2s were transferred to OSL as OSL 2500 series
Ten OSL 2500 series 2-8-2s were transferred to LA&SL as LA&SL 2700 series
Ten OSL 2500 series 2-8-2s were transferred to UP as UP 2300 series
Ten LA&SL 2700 series 2-8-2s were transferred to OSL as OSL 2500 series
Six UP 4300 series 0-6-0s were transferred to OSL as OSL 4700 series
1924
| Added (35) | 5 | 4-8-2 | UP 7865-7869 |
| 10 | 2-10-2 | UP 5515-5524 | |
| 20 | 2-8-8-0 | UP 3645-3664 | |
| Retired (31) | 2 | 0-6-0 | UP 4324, 4700 |
| 4 | 2-8-0 | UP 104, 133, 139, 416 | |
| 3 | 4-4-0 | UP 904, 921, 923 | |
| 22 | 4-6-0 | UP 1200, 1201, 1203, 1204, 1207, 1208, 1213, 1214, 1215, 1246, 1345, 1357, 1518, 1519, 1520, 1525, 1526, 1529, 1539, 1542, 1701, 1703 |
UP 2-8-0 416 rebuilt to 0-8-0 4500
1925
| Added (1) | 1 | 4-10-2 | UP 8000 (three cylinder design) |
| Retired (77) | 7 | 0-6-0 | UP 4227, 4228, 4340, 4343, 4345, 4346, 4347 |
| 1 | 2-8-0 | UP 106 | |
| 9 | 4-4-0 | UP 937, 1050, 1051, 1106, 1119, 1120, 1121, 1122, 1123 | |
| 9 | 4-4-2 | UP 3300, 3301, 3312, 3318, 3319, 3376, 3377, 3379, 3402 | |
| 46 | 4-6-0 | UP 1211, 1216, 1223, 1226, 1228, 1229, 1232, 1240, 1252, 1257, 1265, 1266, 1271, 1274, 1275, 1278, 1279, 1281, 1282, 1284, 1285, 1288, 1333, 1335, 1338, 1502, 1505, 1509, 1510, 1512, 1523, 1524, 1528, 1536, 1555, 1560, 1561, 1591, 1592, 1593, 1594, 1595, 1596, 1704, 1707, 1710 |
|
| 5 | 4-8-0 | UP 1800-1804 |
1926
(No attempt has been made to determine a start-of-year total of the locomotive fleet for the years from 1915 to 1926 due to incomplete records of retirements, and incomplete records of the 1915 renumbering.)
| Added (24) | 9 | 4-10-2 | LA&SL 8800-8808 (three-cylinder design) |
| 15 | 4-12-2 | UP 9000-9014 | |
| Retired (79) | 5 | 0-6-0 | UP 4323, 4341, 4701, 4702, 4900 |
| 9 | 2-8-0 | UP 101, 102, 108, 109, 110, 111, 112, 114, 116 | |
| 10 | 4-4-0 | UP 906, 914, 919, 931, 933, 941, 943, 1114, 1117, 1118 | |
| 1 | 4-4-2 | UP 3378 | |
| 48 | 4-6-0 | UP 1221, 1222, 1225, 1233, 1234, 1237, 1250, 1253, 1254, 1256, 1262, 1264, 1267, 1268, 1269, 1270, 1272, 1277, 1280, 1283, 1286, 1287, 1289, 1300, 1306, 1309, 1317, 1318, 1330, 1339, 1343, 1361, 1503, 1507, 1511, 1515, 1522, 1543, 1547, 1548, 1550, 1551, 1553, 1557, 1559, 1570, 1712, 1725 |
|
| 1 | 4-6-2 | UP 3164 | |
| 5 | 4-8-0 | UP 1805, 1806, 1807, 1851, 1854 |
1927
1,795 total steam on 1 January 1927
(No purchases)
| Retired (39) | 15 | 0-6-0 | UP 4339, 4342, 4363, 4364, 4370, 4371, 4372, 4373, 4381, 4385, 4390, 4395, 4398, 4726, 4901 |
| 11 | 2-8-0 | UP 115, 130, 143, 711, 712, 713, 714, 715, 716, 717, 4746 | |
| 8 | 4-6-0 | UP 1244, 1365, 1517, 1527, 1531, 1535, 1709, 1732 | |
| 5 | 4-6-2 | UP 2801, 2814, 2822, 2845, 2848 |
1928
1,756 total steam on 1 January 1928
| Added (23) | 23 | 4-12-2 | UP 9015-9029 (15 locomotives), OWRR&N 9700-9707 (8 locomotives) |
| Retired (99) | 17 | 0-6-0 | UP 4338, 4354, 4362, 4376, 4379, 4384, 4387, 4389, 4391, 4393, 4399, 4706, 4718, 4719, 4722, 4724, 4727 |
| 12 | 2-8-0 | UP 151, 156, 157, 4747, 6009, 6016, 6042, 6060, 6064, 6073, 6074, 6084 | |
| 6 | 2-8-8-2 | OSL 3700, 3701, 3702, OWRR&N 3800, 3801, 3802 | |
| 13 | 4-4-2 | UP 3403, 3404, 3405, 3406, 3407, 3408, 3410, 3411, 3500, 3506, 3507, 3508, 3509 |
|
| 36 | 4-6-0 | UP 1230, 1314, 1319, 1321, 1324, 1328, 1329, 1332, 1336, 1360, 1504, 1506, 1508, 1532, 1533, 1534, 1537, 1538, 1544, 1546, 1549, 1552, 1562, 1563, 1564, 1565, 1566, 1567, 1568, 1569, 1571, 1713, 1714, 1727, 1728, 1729 |
|
| 10 | 4-6-2 | UP 2806, 2810, 2817, 2825, 2849, 3154, 3156, 3159, 3162, 3171 | |
| 5 | 4-8-0 | UP 1850, 1852, 1853, 1855, 1856 |
Five OWR&N 5400 series 2-10-2s sent to OSL as OSL 5300 series
Five UP 5000 series 2-10-2s sent to LA&SL as LA&SL 5500 series
1929
1,680 total steam on 1 January 1929
| Added (25) | 25 | 4-12-2 | UP 9030-9054 |
| Retired (51) | 21 | 0-6-0 | UP 4231, 4353, 4358, 4359, 4368, 4380, 4388, 4394, 4400, 4705, 4709, 4714, 4720, 4730, 4732, 4758, 4759, 4760, 4761, 4762, 4763 |
| 14 | 2-8-0 | UP 409, 424, 484, 701, 6017, 6021, 6026, 6037, 6047, 6048, 6052, 6055, 6063, 6065 |
|
| 2 | 4-4-0 | UP 1115, 1116 | |
| 3 | 4-4-2 | UP 3409, 3512, 3514 | |
| 5 | 4-6-0 | UP 1236, 1247, 1315, 1323, 1719 | |
| 6 | 4-6-2 | UP 2804, 2805, 2811, 2840, 3174, 3175 |
1930
1,690 total steam on 1 January 1930
| Added (25) | 25 | 4-12-2 | UP 9078-9087 (10 locomotives), OSL 9500-9514 (15 locomotives) |
| Retired (61) | 23 | 0-6-0 | UP 4232, 4360, 4361, 4382, 4383, 4392, 4429, 4704, 4708, 4710, 4711, 4712, 4713, 4715, 4716, 4717, 4723, 4725, 4728, 4729, 4733, 4734, 4932 |
| 25 | 2-8-0 | UP 100, 103, 153, 270, 297, 331, 444, 450, 488, 515, 521, 522, 550, 551, 552, 553, 554, 734, 754, 4745, 6032, 6034, 6044, 6071, 6083 |
|
| 2 | 4-4-2 | UP 3400, 3401 | |
| 6 | 4-6-0 | UP 1255, 1276, 1363, 1364, 1369, 1558 | |
| 5 | 4-6-2 | UP 2808, 2836, 2837, 2839, 3155 |
1931
1,654 total steam on 1 January 1931
(No purchases)
| Retired (15) | 2 | 0-6-0 | UP 4352, 4927 |
| 6 | 2-8-0 | UP 118, 510, 519, 703, 708, 729 | |
| 7 | 4-6-0 | UP 1368, 1717, 1720, 1722, 1723, 1724, 1726 |
(Acquired electric locomotive E-100 from Glendale & Montrose)
(Acquired 12 ton Davenport for tie plant)
1932
1,639 total steam on 1 January 1932
(No purchases)
| Retired (9) | 6 | 2-8-0 | UP 723, 6011, 6036, 6038, 6058, 6062 |
| 1 | 2-8-2 | UP 2701 | |
| 2 | 4-6-0 | UP 1334, 1721 |
1933
1,630 total steam on 1 January 1933
(No purchases)
| Retired (123) | 13 | 0-6-0 | UP 4229, 4344, 4365, 4401, 4402, 4404, 4409, 4721, 4737, 4738, 4739, 4905, 4910 |
| 59 | 2-8-0 | UP 152, 205, 210, 212, 215, 246, 259, 261, 263, 278, 280, 287, 293, 294, 314, 323, 354, 406, 454, 461, 466, 471, 482, 496, 511, 514, 516, 517, 520, 564, 571, 572, 574, 575, 578, 586, 589, 597, 601, 606, 609, 615, 704, 709, 720, 722, 724, 725, 726, 727, 6000, 6004, 6025, 6027, 6046, 6068, 6078, 6082, 6086 |
|
| 5 | 4-4-0 | UP 932, 935, 940, 942, 945 | |
| 8 | 4-4-2 | UP 3501, 3502, 3503, 3504, 3505, 3510, 3511, 3513 | |
| 16 | 4-6-0 | UP 1245, 1259, 1263, 1303, 1311, 1326, 1362, 1367, 1572, 1574, 1576, 1581, 1582, 1711, 1718, 1746 |
|
| 22 | 4-6-2 | UP 2807, 2813, 2816, 2821, 2831, 2833, 2834, 2838, 2841, 2843, 2847, 3101, 3102, 3103, 3112, 3161, 3165, 3169, 3172, 3173, 3207, 3211 |
(Note: UP's diesel era began with the delivery of the M-10000, a distillate powered articulated Streamliner train, and M-10001, a diesel powered articulated Streamliner train, in May and June 1934.)
Previous -- UP Locomotive Chronology, 1862-1914
Next -- UP Locomotive Chronology, 1934-1982
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