Northern Pacific Railway locomotives
# Northern Pacific Railway locomotives

## Steam locomotive classes

Below is a table of information for the Northern Pacific Railway’s steam roster with a symbol, Whyte notation, common name and notes. (The notes were compiled by Richard Boyland and Wes Barris and first posted May 30, 1991, to the electronic newsgroup rec.railroad.) Included is a breakdown of the Northern Pacific classes, along with the date of their first construction (when known), builder, and road numbers.

### 0-4-0

| Class | Wheel arrangement | Fleet number(s) | Manufacturer | Serial numbers | Year made | Quantity made | Quantity preserved | Year(s) retired | Comments |
| - | - | - | - | - | - | - | - | - | - |
| 0-4-0 — OO ||||||||||
| Minnetonka | 0-4-0ST+T | | Smith and Porter | | 1870 | 4 | 1 | | NP's first locomotives; Minnetonka preserved |
| H | 0-4-0 | 1050–1064 | Baldwin | 4968...7053 | 1880–1883 | 15 | 0 | | |
| H-1 | 0-4-0 | 1070 | Baldwin | 2537 | 1871 | 1 | 0 | 1926 | Rebuilt as 0-4-0T shop switcher 11 |
| H-2 | 0-4-0 | 1003 | Rhode Island | | 1883 | 1 | 0 | | Ex St. Paul and Duluth Railroad 37 |
| H-3 | 0-4-0 | 1004 | Rhode Island | | 1883 | 1 | 0 | | |
| H-4 | 0-4-0 | 1071 | Grant | | | 1 | 0 | | |
| H-5 | 0-4-0 | 1072 | Rhode Island | | | 1 | 0 | | |
| | 0-4-0T | Shop 12 | Baldwin | 10231 | 1889 | 1 | 0 | 1936 | Ex HHS&S |
| | 0-4-0F | Shop 8 | H. K. Porter | 7979 | 1945 | 1 | 1 | | Fireless locomotive for tie creosoting plant |

### 0-6-0

| Class | Wheel arrangement | Fleet number(s) | Manufacturer | Serial numbers | Year made | Quantity made | Quantity preserved | Year(s) retired | Comments |
| - | - | - | - | - | - | - | - | - | - |
| 0-6-0 — OOO ||||||||||
| I | 0-6-0 | 982–999 | Baldwin | 6685...8628 | 1883–1887 | 18 | 0 | | |
| I-1 | 0-6-0 | 981 | NP | | 1891 | 1 | 0 | | |
| I-2 | 0-6-0 | 1000–1002 | Dickson | 611–613 | 1887 | 3 | 0 | | Ex St. Paul and Duluth Railroad 60–62 |
| K-1 | 0-6-0 | 948–976 | Baldwin | 5565...6519 | 1881–1882 | 29 | 0 | | Rebuilt from 2-6-0 |
| K-2 | 0-6-0 | 980 | Baldwin | 6506 | 1882 | 1 | 0 | | Rebuilt from 2-6-0 |
| L | 0-6-0 | 977–979 | Baldwin | 6936...6946 | 1883 | 3 | 0 | | |
| L-1 | 0-6-0 | 940–941 | Grant | 1784–1785 | 1889 | 2 | 0 | | |
| L-2 | 0-6-0 | 930–939 | Rome | 253...650 | 1887–1890 | 10 | 0 | | |
| L-3 | 0-6-0 | 929 | Rome | 506 | 1889 | 1 | 0 | | |
| L-4 | 0-6-0 | 926–928 | Baldwin | 14795–14797 | 1896 | 3 | 1 | | Ex St. Paul and Duluth Railroad 70–72; 927 rebuilt as 0–6–0T shop switcher 10 preserved |
| L-5 | 0-6-0 | 923–925 | Rogers | 5424–5426 | 1899 | 3 | 1 | | Ex St. Paul and Duluth Railroad 73–75; 924 Under restoration Snoqualmie, Wa |
| L-6 | 0-6-0 | 900–919 | Schenectady | 59536–5955 | 1901 | 20 | 0 | 1928–1947 | 914 rebuilt as 0–6–0T shop switcher 9 in 1931 |
| L-7 | 0-6-0 | 1020–1035 | Baldwin Alco (Schen.) | 20107...20775 27361–27366 | 1902–1903 | 15 | 1 | 1929–1956 | 1031 preserved |
| L-8 | 0-6-0 | 922 | Baldwin | 11372 | 1890 | 1 | 0 | 1938 | |
| L-9 | 0-6-0 | 1040–1134 | Alco (M / D / P) Baldwin | 39528...46914 29858...34609 | 1906–1910 | 95 | 2 | 1930s–1950s | 1068 and 1070 preserved |
| L-10 | 0-6-0 | 1160–1169 | Alco (Schen.) | 52025–52034 | 1912 | 10 | 0 | 1950s | |

### 0-8-0

| Class | Wheel arrangement | Fleet number(s) | Manufacturer | Serial numbers | Year made | Quantity made | Quantity preserved | Year(s) retired | Comments |
| - | - | - | - | - | - | - | - | - | - |
| 0-8-0 — OOOO ||||||||||
| G | 0-8-0 | 1151–1159 | NP | | 1906 (rebuilt) | 9 | 0 | 1929–1937 | Rebuilt from class F 2-8-0 locomotives |
| G-1 | 0-8-0 | 1170–1173 | Alco (Brooks) | 61229–61232 | 1919 | 4 | 0 | 1950s | USRA 0-8-0 |
| G-2 | 0-8-0 | 1174–1193 | Alco (Brooks) | 62473–62492 | 1920 | 20 | 0 | 1950s | USRA 0-8-0 copies |

### 2-6-0

| Class | Wheel arrangement | Fleet number(s) | Manufacturer | Serial numbers | Year made | Quantity made | Quantity preserved | Comments |
| - | - | - | - | - | - | - | - | - |
| 2-6-0 — oOOO — Mogul ||||||||||
| D | 2-6-0 | 580–591 | Baldwin | 6851...6909 | 1883 | 12 | 0 | |
| D-1 | 2-6-0 | 942–947 | Baldwin | 5636...5701 | 1881 | 6 | 0 | Rebuilt as 0–6–0 |
| D-2 | 2-6-0 | 550–572 | Baldwin | 9544...9688 | 1888–1889 | 23 | 0 | |
| D-3 | 2-6-0 | 420–424, 450–547 | Baldwin | 10178...11984 | 1899–1891 | 103 | 0 | |
| D-5 | 2-6-0 | 404–418, 426–432 | Baldwin | 10298...11968 | 1899–1891 | 22 | 0 | |
| D-6 | 2-6-0 | 400–403 | Rogers | 4842...5433 | 1893–1899 | 4 | 0 | Ex St. Paul and Duluth Railroad 63–66 |
| K | 2-6-0 | 595–599 | Baldwin | 6590...6629 | 1883 | 5 | 0 | |

### 2-6-2

| Class | Wheel arrangement | Fleet number(s) | Manufacturer | Serial numbers | Year made | Quantity made | Quantity preserved | Year(s) retired | Comments |
| - | - | - | - | - | - | - | - | - | - |
| 2-6-2 — oOOOo — Prairie ||||||||||
| T | 2-6-2 | 2300–2449 | Alco (Brooks) | 39508...42264 | 1906–1907 | 150 | 1 | 1924–1959 | 6 rebuilt as class W-4 (2-8-2); 18 rebuilt as class T-1 2435 survives |
| T-1 | 2-6-2 | 2450–2467 | NP | | 1926–1929 (rebuilt) | 18 | 0 | 1941–1959 | Rebuilt from class T |

### 2-8-0

| Class | Wheel arrangement | Fleet number(s) | Manufacturer | Serial numbers | Year made | Quantity made | Quantity preserved | Year(s) retired | Comments |
| - | - | - | - | - | - | - | - | - | - |
| 2-8-0 — oOOOO — Consolidation ||||||||||
| F | 2-8-0 | 95–103 | Baldwin | 6591...7002 | 1883 | 9 | 0 | | Rebuilt to class G (0–8–0) in 1906 |
| F-1 | 2-8-0 | 50–81 | Baldwin | 9505...11959 | 1888–1891 | 32 | 0 | 1926–1951 | |
| F-2 | 2-8-0 | 82–83 | Baldwin | | 1888 | 2 | 0 | 1927–1928 | |
| F-3 | 2-8-0 | 84–91 | Rome | 455...651 | 1889–1890 | 8 | 0 | 1920s/30s | |
| F-4 | 2-8-0 | 92–94 | Grant | 1714–1716 | 1887 | 3 | 0 | | |
| F-5 | 2-8-0 | 45–46 | Schenectady | | 1900 | 2 | 0 | 1926 | Ex Seattle and International Railway 11–12; Rebuilt as 0–8–0 |
| F-6 | 2-8-0 | 47 | Richmond | | 1895 | 1 | 0 | 1927 | Ex Seattle and International Railway 8; Rebuilt as 0–8–0 |
| F-7 | 2-8-0 | 48–49 | Rhode Island | 1882–1883 | 1888 | 2 | 0 | | Ex Seattle and International Railway 7 & 9 |
| F-8 | 2-8-0 | 4–6 | PRR Altoona | | 1891 | 3 | 0 | | |
| Y | 2-8-0 | 30–43 | Schenectady | 4900...4913 | 1898 | 14 | 0 | 1941–1955 | |
| Y-1 | 2-8-0 | 17–29 | Schenectady | 5468–5480 | 1899–1900 | 13 | 1 | 1925–1958 | 25 preserved |
| Y-2 | 2-8-0 | 1250–1279 | Schenectady Alco (Richmond) | 5881–5892 25815–25832 | 1901–1902 | 30 | 0 | 1925–1958 | |
| Y-3 | 2-8-0 | 1200–1213 | Schenectady | 5893–5906 | 1901 | 14 | 0 | 1945–1955 | |
| Y-4 | 2-8-0 | 1280–1293 | Alco (Schen.) | 27347–27360 | 1903 | 14 | 0 | 1925–1935 | |
| Y-5 | 2-8-0 | 1214–1223 | Alco (Schen.) | 27337–27346 | 1903 | 10 | 0 | 1927–1937 | |

### 2-8-2

| Class | Wheel arrangement | Fleet number(s) | Manufacturer | Serial numbers | Year made | Quantity made | Quantity preserved | Year(s) retired | Comments |
| - | - | - | - | - | - | - | - | - | - |
| 2-8-2 — oOOOOo — Mikado ||||||||||
| W | 2-8-2 | 1500–1659 | Alco (Brooks) | 30203...42234 | 1904–1907 | 160 | 0 | 1930–1959 | |
| W-1 | 2-8-2 | 1660–1699 | Alco (Schen.) | 46840–46879 | 1910 | 40 | 0 | 1925–1958 | |
| W-2 | 2-8-2 | 1900–1919 | Alco (Brooks) | 30222...31134 | 1904–1905 | 20 | 0 | 1930–1958 | Built as tandem compound locomotives |
| W-3 | 2-8-2 | 1700–1834 | Alco (Brooks) | 52849...62466 | 1913–1920 | 135 | 1 | 1926–1960 | Ten sold to Spokane, Portland and Seattle Railway as their 530–539; 539 is preserved. No. 1776 pulled the farewell to steam excursions for the NP in 1957. |
| W-4 | 2-8-2 | 2500–2505 | NP (Brainerd Shops) | | 1919 (rebuilt) | 6 | 0 | 1955–1958 | Rebuilt from class T 2-6-2 locomotives |
| W-5 | 2-8-2 | 1835–1859 | Alco (Schen.) | 64348–64372 | 1923 | 25 | 0 | 1952–1960 | |

### 2-10-0

| Class | Wheel arrangement | Fleet number(s) | Manufacturer | Serial numbers | Year made | Quantity made | Quantity preserved | Year(s) retired | Comments |
| - | - | - | - | - | - | - | - | - | - |
| 2-10-0 — oOOOOO — Decapod ||||||||||
| M | 2-10-0 | 1–2 | Baldwin | 8168–8169 | 1886 | 2 | 0 | 1930–1933 | |

On the NP the Decapods were used at either end of a very short train over the temporary switchback line across Stampede Pass while Stampede Tunnel was being constructed between 1887 and 1888. They featured blind drivers (no flanges on the wheels) for operation on sharp curves. They were later relegated to use as yard switchers.

### 4-4-0

| Class | Wheel arrangement | Fleet number(s) | Manufacturer | Serial numbers | Year made | Quantity made | Quantity preserved | Comments |
| - | - | - | - | - | - | - | - | - |
| 4-4-0 — ooOO — American ||||||||||
| 25½C | 4-4-0 | 3–26 | Baldwin | 2639...2662 | 1871–1873 | 23 | 1 | 21 sold in 1877 to the Canadian Pacific Railway and became CPR no. 1 Countess of Dufferin, and is preserved as such. |
| B | 4-4-0 | 650–671 | Baldwin | 8560...8688 | 1887 | 22 | 0 | |
| B-1 | 4-4-0 | 672–673 | Baldwin | 10247...10252 | 1889 | 2 | 0 | |
| B-2 | 4-4-0 | 649 | Schenectady | | 1887 | 1 | 0 | |
| B-3 | 4-4-0 | 691–692 | Grant | 1783, 1780 | 1888 | 2 | 0 | |
| C-1 | 4-4-0 | 680–691 | New York | 35–46 | 1883 | 12 | 1 | 684 preserved |
| C-2 | 4-4-0 | 694–695 | Baldwin | 6581...6583 | 1883 | 2 | 0 | |
| C-3 | 4-4-0 | 696–740 | Baldwin | 6535...10692 | 1883–1890 | 45 | 0 | |
| C-4 | 4-4-0 | 741–742 | Baldwin | 5997...5999 | 1882 | 2 | 0 | |
| C-5 | 4-4-0 | 743–747 | New York | 6–10 | 1883 | 15 | 0 | |
| C-6 | 4-4-0 | 748–803 | Portland | 463–518 | 1888 | 56 | 0 | |
| C-7 | 4-4-0 | 817–818 | Pittsburgh | 862 | 1888 | 1 | 0 | |
| C-8 | 4-4-0 | 805–806 | Taunton | 829–830 | 1882 | 2 | 0 | |
| C-9 | 4-4-0 | 807–816 | Hinkley | 1548...1560 | 1882 | 10 | 0 | |
| C-10 | 4-4-0 | 817–818 | Baldwin | 5714...5902 | 1881 | 2 | 0 | |
| C-11 | 4-4-0 | 819–865 | Baldwin | 4584...6523 | 1879–1883 | 47 | 0 | |
| C-12 | 4-4-0 | 866–869 | Manchester | 868–871 | 1880–1881 | 4 | 0 | |
| C-13 | 4-4-0 | 870–898 | Portland | 376...461 | 1881–1883 | 29 | 0 | |
| C-14 | 4-4-0 | 899 | Baldwin | 5715 | 1881 | 1 | 0 | |
| C-19 | 4-4-0 | 675–678 | Rome | 249–252 | 1887 | 4 | 0 | |
| C-20 | 4-4-0 | 633–637 | Dickson | 605–609 | 1887 | 5 | 0 | Ex St. Paul and Duluth Railroad 54–58 |
| C-21 | 4-4-0 | 638–640 | Rome | 350–352 | 1888 | 3 | 0 | Ex St. Paul and Duluth Railroad 67–69 |
| C-22 | 4-4-0 | 1110–1118 | Brooks | 1105...1198 | 1886 | 8 | 0 | Ex St. Paul and Duluth Railroad 41–48 |
| C-23 | 4-4-0 | 1123–1128 | Rogers | 2945–2948 | 1883 | 4 | 0 | Ex St. Paul and Duluth Railroad 18–21 |
| C-24 | 4-4-0 | 1129–1130 | McQueen | | 1881 | 2 | 0 | |
| C-25 | 4-4-0 | 1131–1134 | Baldwin | | 1879 | 4 | 0 | |
| C-26 | 4-4-0 | 1135–1136 | Baldwin | | 1870 | 2 | 0 | |
| C-27 | 4-4-0 | 1137 | Baldwin | | 1870 | 1 | 0 | |
| C-28 | 4-4-0 | 1138–1139 | Baldwin | | 1871 | 2 | 0 | |
| C-29 | 4-4-0 | 1140–1144 | Baldwin | | 1874 | 5 | 0 | |
| C-30 | 4-4-0 | 1145–1148 | Rhode Island | 1779...1937 | 1887–1888 | 4 | 0 | Ex Seattle and International Railway 1–4 |
| C-31 | 4-4-0 | 1149–1150 | Rhode Island | 2085–2086 | 1888 | 1 | 0 | Ex Seattle and International Railway 101–102 |
| C-32 | 4-4-0 | 1151 | Baldwin | | | 1 | 0 | |
| C-33 | 4-4-0 | 1153 | | | | 1 | 0 | |

### 4-4-2

| Class | Wheel arrangement | Fleet number(s) | Manufacturer | Serial numbers | Year made | Quantity made | Quantity preserved | Year(s) retired | Comments |
| - | - | - | - | - | - | - | - | - | - |
| 4-4-2 — ooOOo — Atlantic ||||||||||
| N | 4-4-2 | 600–602 | Baldwin | 17290–17292 | 1899 | 3 | 0 | 1927–1932 | Ex St. Paul and Duluth Railroad 80–82 |
| N-1 | 4-4-2 | 603–605 | Baldwin | 33291–33293 | 1909 | 3 | 0 | 1936 | |

### 4-6-0

| Class | Wheel arrangement | Fleet number(s) | Manufacturer | Serial numbers | Year made | Quantity made | Quantity preserved | Year(s) retired | Comments |
| - | - | - | - | - | - | - | - | - | - |
| 4-6-0 — ooOOO — Ten-Wheeler ||||||||||
| E | 4-6-0 | 390–398 | Baldwin | 6392...7021 | 1882 | 9 | 0 | 1910s | |
| E-1 | 4-6-0 | 360–364 | Manchester | 1407–1411 | 1888 | 5 | 0 | | |
| E-2 | 4-6-0 | 370–383 | Baldwin | 9691...9704 | 1888 | 14 | 0 | 1926–1932 | |
| E-3 | 4-6-0 | 330–358 | Baldwin | 10182...11301 | 1889–1890 | 29 | 0 | 1925–1935 | |
| E-4 | 4-6-0 | 388–389 | Rhode Island | 2432–2433 | 1890 | 2 | 0 | | |
| E-5 | 4-6-0 | 386–387 | Schenectady | 4072–4073 | 1893 | 2 | 0 | 1927 | |
| E-6 | 4-6-0 | 365 | Rhode Island | 2337 | 1890 | 1 | 0 | | |
| E-7 | 4-6-0 | 366–368 | Cooke | 2223–2225 | 1892 | 3 | 0 | | |
| E-8 | 4-6-0 | 369 | Baldwin | 11280 | 1890 | 1 | 0 | 1919 | |
| P | 4-6-0 | 250–258, 270–278 | Schenectady | 4542...4726 | 1897–1898 | 18 | 0 | 1926–1941 | |
| P-1 | 4-6-0 | 207–218, 226–236 | Schenectady Alco (Schen.) | 5122...5931, 25660...25841 | 1899–1902 | 23 | 0 | 1927–1940 | |
| P-2 | 4-6-0 | 240–249 | Schenectady Alco (Schen.) | 5716...5929, 25657...25842 | 1901–1902 | 10 | 0 | 1935–1941 | |
| P-3 | 4-6-0 | 1400–1419 | Schenectady Alco (Rich.) | 5916–5925, 25662–25671 | 1901–1902 | 20 | 0 | 1920s | |
| R | 4-6-0 | 170–189 | Schenectady | 4535...4593 | 1897 | 20 | 0 | 1920s | |
| S | 4-6-0 | 153–168 | Schenectady | 4727...4899 | 1898 | 16 | 0 | 1920s | |
| S-1 | 4-6-0 | 134–147 | Schenectady | 5134...5147 | 1899 | 14 | 0 | 1926–1929 | |
| S-2 | 4-6-0 | 104–133 | Schenectady | 5473...5612 | 1900 | 30 | 0 | 1925–1928 | |
| S-3 | 4-6-0 | 1300–1323 | Schenectady Alco (Schen.) | 5907–5915, 25650...25840 | 1901–1902 | 24 | 0 | 1926–1934 | |
| S-4 | 4-6-0 | 1350–1399 | Baldwin | 20273...20662 | 1907 | 40 | 4 | 1945–1958 | 1354, 1356, 1364 and 1382 preserved |
| S-10 | 4-6-0 | 320–329 | Alco (Rogers) | 37575–37584 | 1907 | 10 | 1 | 1930–1950 | 328 preserved |
| S-11 | 4-6-0 | 150–152 | Grant | 1766–1768 | 1888 | 3 | 0 | | |

### 4-6-2

| Class | Wheel arrangement | Fleet number(s) | Manufacturer | Serial numbers | Year made | Quantity made | Quantity preserved | Year(s) retired | Comments |
| - | - | - | - | - | - | - | - | - | - |
| 4-6-2 — ooOOOo — Pacific ||||||||||
| Q | 4-6-2 | 2080–2099 | Alco | 27317–27336 | 1903 | 20 | 0 | 1929–1947 | |
| Q-1 | 4-6-2 | 2100–2147 | Alco | 30228...42501 | 1904–1907 | 48 | 0 | 1930–1952 | |
| Q-2 | 4-6-2 | 2175–2176 | Alco | 39999–40000 | 1906 | 2 | 0 | 1934 | Built as Cole balanced compounds |
| Q-3 | 4-6-2 | 2148–2170 | Baldwin | 33248...33627 | 1909 | 23 | 4 | 1945–1959 | 2152, 2153, 2156 and 2164 preserved |
| Q-4 | 4-6-2 | 2177–2207 | Baldwin | 33796...34144 | 1909–1910 | 31 | 0 | 1931–1959 | |
| Q-4 | 4-6-2 | 2208–2225 | Alco | 48186–48203 | 1910 | 18 | 0 | 1931–1959 | |
| Q-5 | 4-6-2 | 2226–2235 | Alco | 62422–62441 | 1920 | 20 | 0 | 1947–1959 | |
| Q-6 | 4-6-2 | 2246–2265 | Alco | 64328–64347 | 1923 | 20 | 0 | 1953–1959 | |

### 4-8-0

| Class | Wheel arrangement | Fleet number(s) | Manufacturer | Serial Numbers | Year made | Quantity made | Quantity preserved | Year(s) retired | Comments |
| - | - | - | - | - | - | - | - | - | - |
| 4-8-0 — ooOOOO Twelve-Wheeler or Mastodon ||||||||||
| X | 4-8-0 | 13–16 | Schenectady | 4523–4526 | 1897 | 4 | 0 | 1936–1940 | |

### 4-8-4

| Class | Wheel arrangement | Fleet number(s) | Manufacturer | Serial numbers | Year made | Quantity made | Quantity preserved | Year(s) retired | Comments |
| - | - | - | - | - | - | - | - | - | - |
| 4-8-4 — ooOOOOoo — Northern ||||||||||
| A | 4-8-4 | 2600–2611 | Alco | 67010–67021 | 1926 | 12 | 0 | 1949–1959 | Serial nos. not in order |
| A-1 | 4-8-4 | 2626 | Alco | 68056 | 1930 | 1 | 0 | 1955 | ex-Timken 1111 |
| A-2 | 4-8-4 | 2650–2659 | Baldwin | 61771–61780 | 1934–1935 | 10 | 0 | 1953–1958 | |
| A-3 | 4-8-4 | 2660–2667 | Baldwin | 62163–62170 | 1938 | 8 | 0 | 1954–1958 | |
| A-4 | 4-8-4 | 2670–2677 | Baldwin | 64155–64162 | 1941 | 8 | 0 | 1954–1958 | |
| A-5 | 4-8-4 | 2680–2689 | Baldwin | 64667–64676 | 1943 | 10 | 0 | 1957–1959 | |

### Mallet and simple articulated locomotives

| Class | Wheel arrangement | Fleet number(s) | Manufacturer | Serial numbers | Year made | Quantity made | Quantity preserved | Year(s) retired |
| - | - | - | - | - | - | - | - | - |
| Mallet and Simple Articulated Locomotives ||||||||||
| Z | 2-6-6-2 | 3000–3015 | Baldwin | 30566...31557 | 1907 | 16 | 0 | 1927–1939 |
| Z-1 | 2-6-6-2 | 3100–3105 | Baldwin | 34389...34483 | 1910 | 6 | 0 | |
| Z-2 | 2-8-8-2 | 4000–4004 | Baldwin | 34382–34386 | 1910 | 5 | 0 | 1945 |
| Z-3 | 2-8-8-2 | 4005–4025 | Alco | 52839...62472 | 1913, 1917, 1920 | 21 | 0 | 1945–1958 |
| Z-4 | 2-8-8-2 | 4500–4503 | Alco | 64373–64376 | 1923 | 4 | 0 | 1951–1954 |
| Z-5 | 2-8-8-4 | 5000 | Alco | 67578 | 1928 | 1 | 0 | 1952 |
| Z-5 | 2-8-8-4 | 5001–5011 | Baldwin | 61292...61495 | 1930 | 11 | 0 | 1953–1957 |
| Z-6 | 4-6-6-4 | 5100–5120 | Alco | 68760–68780 | 1936–1937 | 21 | 0 | 1955–1959 |
| Z-7 | 4-6-6-4 | 5121–5126 | Alco | 69540–69545 | 1941 | 6 | 0 | 1956–1959 |
| Z-8 | 4-6-6-4 | 5130–5149 | Alco | 70143...71962 | 1943–44 | 20 | 0 | 1955–1959 |

Both of the Northern Pacific's 2-6-6-2 classes were copies of GN designs, including their Belpaire fireboxes, a rarity on NP steam locomotives. NP 3015, last of the Class Z's, had a troubled existence, suffering a crown sheet failure at Kennedy, Washington, on Stampede Pass circa 1916, then later derailing on the Wallace Branch in Idaho in 1933. In both instances the engine crew members were killed or injured.

The Z-2 2-8-8-2s wound up in helper service on Bozeman Pass. The Z-3s, purchased in successive batches, became the main line road and helper power on the route across Stampede Pass until the arrival of EMD's FTs in April, 1944. They were also used as helpers on the steep ascent of the NP's Prairie Line out of Tacoma, Washington, as well as in hauling wartime munitions trains over Stimson Hill between Elma, Washington and the Puget Sound Naval Shipyard at Bremerton, Washington, circa 1944–1945.

The Z-5 Yellowstones were two locomotives under one boiler, these were the largest locomotives in the world when delivered in 1928. They eliminated the use of two locomotives on the head-end of freight trains on the Yellowstone Division in eastern Montana and western North Dakota. The 2-8-8-4 was first built for the Northern Pacific Railway in 1928.

The 4-6-6-4 locomotives were so large that in many places in Montana the Northern Pacific had to widen the centers of its double track on the Rocky Mountain Division. As a rule they did not work west of Easton, Washington, due to the confines of Stampede Tunnel under the summit of Stampede Pass. Despite the inaccuracy, these classes were generally referred to by NP engine crews as Mallets.

## Diesel locomotives

### American Locomotive Company

Northern Pacific Railway's Alcos were mostly confined to the east end of the road, on the Lake Superior and St. Paul Divisions.

| Model | hp | Quantity | Built | Road numbers | Notes |
| - | - | - | - | - | - |
| HH-660 | 660 | 3 | 1940 | 600–602 | Delivered as 125–127; first two sold to NP subsidiary Walla Walla Valley Railway |
| S-1 | 660 | 1 | 1945 | 603 | Delivered as 131 |
| S-2 | 1000 | 13 | 1941–1949 | 700–712 | Delivered as 107–108, 113–118, 150–152 |
| S-4 | 1000 | 12 | 1951–1953 | 713–724 | |
| S-6 | 900 | 1 | 1955 | 750 | |
| RS-1 | 1000 | 4 | 1945 | 800–803 | Delivered as 155–158 |
| RS-3 | 1600 | 14 | 1953–1955 | 850–863 | |
| RS-11 | 1800 | 18 | 1958–1960 | 900–917 | |

### Baldwin Locomotive Works

| Model | hp | Quantity | Built | Road numbers | Notes |
| - | - | - | - | - | - |
| VO-660 | 660 | 3 | 1940–1942 | 650–652 | Delivered as 128–130 |
| VO-1000 | 1000 | 28 | 1941–1945 | 400–427 | Delivered as 109–112, 119–124, 153–154, 159–174 |
| DRS 4-4-1500 | 1500 | 2 | 1948 | 500–501 | Delivered as 175–176. Rebuilt 1959 and 1966 with EMD 567 engine |
| DRS 6-6-1500 | 1500 | 1 | 1948 | 525 | Delivered as 177. Rebuilt 1959 with EMD 567 engine |

### Electro-Motive Division

| Model | hp | Quantity | Built | Road numbers | Notes |
| - | - | - | - | - | - |
| NW | 1000 | 1 | 1938 | 100 | Rebuilt 1956 by EMD as SW900m |
| NW2 | 1000 | 7 | 1940–1948 | 99, 101–106 | 99 was New York, Ontario and Western 115, bought 1957 |
| SW7 | 1200 | 8 | 1949 | 107–114 | |
| SW9 | 1200 | 4 | 1952–1953 | 115–118 | |
| SW1200 | 1200 | 59 | 1955–1957 | 119–177 | |
| GP7 | 1500 | 20 | 1950–1953 | 550–569 | |
| GP9 | 1750 | 176 | 1954–1958 | 200–375 | |
| GP18 | 1800 | 9 | 1960 | 376–384 | |
| FT | 1350 | 22 A, 22 B | 1944 | 5400ABCD–5410ABCD | Delivered as 6000ABCD–6010ABCD |
| F3 | 1500 | 25 A 24 B | 1947–1948 | 6000A-6004C, 6005B-6006C, 6500A-6509C, 6005A-6006D, 6051A-6052A, 6503C-6506C | 6000s are freight, 6500s are passenger |
| F7 | 1500 | 45 A 34 B | 1947–1952 | 6007A-6012D, 6007B-6012B, 6013D-6018D, 6013C-6018C, 6019D-6020D, 6019C-6020C, 6050B, 6500C, 6501C-6502C, 6507C-6508C, 6509C-6512C, 6510B-6512B, 6513C, 6513B, 6550B, 6551B-6553B, | 6000s are freight, 6500s are passenger |
| FP7 | 1500 | 2 | 1952 | 6600–6601 | Used on St. Paul to Winnipeg passenger train |
| F9 | 1750 | 39 A 32 B | 1949–1956 | 6700C, 6700B, 6700C, 6701C, 6701B, 6702A-6704A, 6702B-6703B, 6702C, 6703A-6705A, 6703C, 6704B-6709B, 6704C, 6705C, 6706A, 6706C, 6707A, 6707C, 6710B, 7000D-7001D, 7000C-7001C, 7002D-7006D, 7002C-7006C, 7007D, 7007C, 7008D-7009D, 7008C-7009C, 7010D-7014D, 7010C-7014C, 7050A, 7051A-7051A | 6700s are passenger, 7000s are freight. 7003D is preserved at the Oklahoma Railway Museum in Oklahoma City, lettered as Frisco 814. 7012A donated to Western Forest Industries Museum / Mt Rainier Scenic RR in Mineral, WA. |
| SD45 | 3600 | 30 | 1966–1968 | 3600–3629 | 20 more on order at merger into Burlington Northern |

### General Electric

| Model | hp | Quantity | Built | Road numbers | Notes |
| - | - | - | - | - | - |
| 44-Ton | 380 | 1 | 1946 | 98 | South Tacoma shops switcher |
| 44-Ton | 400 | 1 | 1943 | 99 | Ordered by NP subsidiary Duluth Union Depot and Transfer; temporarily delivered to NP while DUDT resolved labor issues, then transferred to them as No. 5 |
| U-25C | 2500 | 30 | 1964–1965 | 2500–2529 | |
| U-28C | 2800 | 12 | 1966 | 2800–2811 | |
| U-33C | 3300 | 10 | 1969 | 3300–3309 | |
