Northern Pacific Diesel Roster (All-Time)

Published: November 14, 2026

The Northern Pacific bought its diesels from Alco, Baldwin, Electro-Motive, and General Electric. It did not buy Fairbanks-Morse. The early switchers worked the yards. F units covered the North Coast Limited, the Mainstreeter, and the Alaskan, and they handled through freight. There were no E units. GP7s, GP9s, and GP18s took the road jobs as steam left. The last new road locomotives before the merger were the SD45s and the U33Cs.

NW No. 100 of 1938 later ran as SW900 No. 100. That is the same frame. F7A No. 6500C later ran as an F9A on the same serial. Three Baldwin switchers and the Alco S6 later ran as slugs, again the same frames. The steam classes are the steam roster. The company history is the Northern Pacific page.

Northern Pacific F7A 6507-A with train 3, the westbound Alaskan, at Trout Creek, Montana, in May 1949

F7A No. 6507-A is ahead of train No. 3, the westbound “Alaskan,” at a flag stop at Trout Creek, Montana, in May 1949. On this day the train carried an RPO, mail and express, coaches, a cafe, and a Pullman sleeper. A. E. Bennett photo.

On this page: At a glance · Numbers · Alco · Baldwin · Electro-Motive · General Electric · Sources

At a glance

Item	Detail
Railroad	Northern Pacific. Mark NP. Company Northern Pacific. Successor Burlington Northern, operations at 12:01 a.m. on March 2, 1970
Builders	Alco, Baldwin, Electro-Motive, and General Electric. No Fairbanks-Morse
Passenger	F units on the North Coast Limited, the Mainstreeter, and the Alaskan. No E units
Through freight	FT, F3, F7, and F9 cabs, then GP7s, GP9s, GP18s, SD45s, U25Cs, U28Cs, and U33Cs
Yards	Switchers from the 1938 NW through the SW1200s, and the Alco and Baldwin switchers
Same frames	NW 100 later SW900 100. F7A 6500C later an F9A. Three Baldwin switchers and S6 750 later ran as slugs
Last new road power	SD45s, 1966–1968, and U33Cs, July 1969
Steam	Northern Pacific steam roster

Numbers

Each row is one builder order. The quantity is the count of road numbers on that row. Where a printed number string runs past the serials, the quantity follows the serials and the note names the printed string. A serial printed in parentheses is an earlier frame. That line is left off this list.

Switcher numbers in the 100s were used by more than one builder. An Alco, a Baldwin, and an Electro-Motive switcher can share a number and still be three locomotives. The 6000-series cab numbers were used again when the F7s arrived. F7A Nos. 6500C, 6501C, and 6502C reuse F3B numbers. F7A No. 6500C was rebuilt to an F9A on serial 8731. That is the same frame as the F7A, and it is not the F3B.

NW No. 100 later ran as SW900 No. 100. The trade-in list says the trade-in was an NW. GP9s 351–357 are printed on the production list as 345–357. The seven serials are 24020–24026, and 345–350 are the previous order. The Northern Pacific Terminal Company of Oregon had its own switchers. They are not in this list.

Many of these locomotives kept running after Burlington Northern began operations at 12:01 a.m. on March 2, 1970. The tables keep the Northern Pacific numbers. A second number in the notes is the renumber printed on that builder line.

Alco

Alco built the HH660s, the S1, the S2s, the S4s, the RS1s, the RS3s, one S6, and the RS11s. The HH660s, the S1, and the S2s worked the yards. The S4s and the road switchers worked the yards and the local freight. S6 No. 750 was rebuilt to slug 701B. That is the same frame.

Model	Road numbers	Qty	Serial	Order	Built	Notes
HH660	125–127	3	69236–69238	S1818	March 1940	Nos. 125 and 126 later 600 and 601. The renumber cell for No. 125 uses a quotation mark. The line for No. 127 has no second number
S2	107–108	2	69419–69420	S1817-3	March 1941	Later 700 and 701. The construction list prints a backtick before 107
S2	113–114	2	69930–69931	S1863	August 1942	Later 702 on both lines
S2	115	1	70072	S1890	August 1943	Later 704
S2	116	1	70073	S1890	September 1943	Later 705
S2	117	1	70193	S1891	September 1943	Later 706
S2	118	1	70194	S1891	October 1943	Later 707
S2	150	1	70950	S1892	October 1943	Later 708
S2	151	1	70951	S1892	November 1943	Later 709
S2	152	1	72023	S1930	April 1944	Later 710
S2	711	1	77939	S3123	January 1948	The date cell reads January 1948. The next serial, No. 712, reads December 1949
S2	712	1	77940	S3123	December 1949	—
S4	713	1	79230	S3176	December 1951	Later 913. The engine cell reads 6-539T. The rest of order S3176 reads 12-244
S4	714	1	79331	S3176	October 1951	Later 914
S4	715–716	2	79332–79333	S3176	November 1951	Later 915 and 916. The renumber for No. 716 is printed without a number sign
S4	717–719	3	80462–80464	S3217	May 1953	Later 917–919
S4	720–724	5	80964–80968	S3231	December 1953	Later 920–924
S1	131	1	73585	S1969	August 1945	Later 603. The renumber cell uses a quotation mark
RS1	155	1	73761	S1978	June 1945	Later 800
RS1	156	1	74316	S3001	October 1945	Later 801
RS1	157–158	2	73765–73766	S1978	August 1945	No. 157 later 802. The renumber cell for No. 158 reads b> #853
RS3	850–852	3	80244, 8024\5, 80246	S3212	March 1953	The serial cell for No. 851 reads 8024\5
RS3	853–856	4	80655–80658	S3222	December 1953	—
RS3	857–860	4	81154–81157	S3239	March 1955	Renumbered 4081–4084. The number cell for No. 857 includes a period
RS3	861–862	2	81158–81159	S3239	April 1955	Renumbered 4085 and 4086
RS3	863	1	81164	S3239	May 1955	—
S6	750	1	80922	S3230	May 1955	Rebuilt to slug 701B. Same frame
RS11	900–901	2	82830–82831	S3294	January 1958	Renumbered 4180 and 4181
RS11	902–903	2	82881–82882	S3297	1958	The date cell reads 1958, with no month. Renumbered 4182 and 4183
RS11	904	1	82948	S33021	July 1958	The order cell reads S33021. The next units this month read S3302. Renumbered 4184
RS11	905–911	7	82949–82955	S3302	July 1958	Renumbered 4185–4191
RS11	912–917	6	83582–83587	S3325	June 1960	—

Baldwin

Baldwin built three VO-660s, the VO-1000s, and three DRS-4-4-1500s. Nos. 128, 130, and 121 later ran as slugs ET-2, ET-1, and ET-3. Those are the same frames. The construction list classes No. 177 a DRS-4-4-1500, the same model as Nos. 175 and 176, and it dates No. 177 to August 12, 1948.

Model	Road numbers	Qty	Serial	Order	Built	Notes
VO-660	128	1	62392	VO #1669	May 20, 1940	Later 650. Rebuilt to slug ET-2 in May 1950. Same frame
VO-660	129–130	2	64245–64246	VO #1789, #1790	April 1942	No. 129 later 651. No. 130 later 652, and rebuilt to slug ET-1 in July 1959
VO-1000	109–110	2	62503–62504	VO #1735, #1737	June 1941	Later 400 and 401. The model cell for No. 109 reads V01000
VO-1000	111–112	2	64428–64429	VO #1870, #1873	October 1942	Later 402 and 403
VO-1000	119–121	3	70139–70141	—	February 1944	Later 404–406. No. 121 was rebuilt to slug ET-3 in February 1965
VO-1000	122	1	70153	VO #2577	March 10, 1944	Later 407
VO-1000	153	1	70842	VO #2601	May 2, 1944	Later 410
VO-1000	154	1	70860	VO #2619	May 7, 1944	Later 411
VO-1000	123	1	70861	VO #2620	June 2, 1944	Later 408
VO-1000	124	1	71926	VO #2646	August 2, 1944	Later 409
VO-1000	160	1	71752	VO #2991	March 14, 1945	Later 413
VO-1000	159	1	71751	VO #2990	April 14, 1945	Later 412
VO-1000	161	1	72011	VO #3014	April 21, 1945	Later 414
VO-1000	162–164	3	72023–72025	—	July 1945	Later 415–417. Baldwin construction number 72023 is also the Alco construction number of S2 No. 152. They are two locomotives
VO-1000	165–166	2	72036–72037	—	August 1945	Later 418 and 419
VO-1000	167	1	71541	VO #2361	October 11, 1945	Later 420
VO-1000	168	1	71545	VO #2364	October 26, 1945	Later 421
VO-1000	169–174	6	71546–71551	—	November 1945	Later 422–427
DRS-4-4-1500	175–176	2	73645–73646	608SC #3754, #3755	September 1948	Later 500 and 501
DRS-4-4-1500	177	1	73838	608SC #3974	August 12, 1948	Later 525. The model cell reads DRS-4-4-1500. The date cell reads August 12, 1948

Electro-Motive

Electro-Motive built the switchers, the F units, the GP7s, the GP9s, the GP18s, and the SD45s. The 1938 NW is the first diesel in this list. FTs, then F3s, F7s, and F9s, handled the through trains. The passenger trains ran behind those cabs. GP7s arrived in 1950, GP9s in 1954, and GP18s in 1960. The SD45s of 1966, 1967, and 1968 were the last new Electro-Motive road locomotives.

Model	Road numbers	Qty	Serial	Order	Built	Notes
NW	100	1	732	E222	December 1938	Later SW900 100, order 7539, January 1957, serial printed (732). The trade-in list says the trade-in was an NW. Same frame
NW2	101–103	3	995–997	E294	February–March 1940	—
NW2	104–106	3	1310–1312	E381	May 1941	—
SW7	107–114	8	10932–10939	6054	November–December 1949	—
SW9	115–117	3	15684–15686	4153	February 1952	—
SW9	118	1	17478	4166	January 1953	—
SW1200	119–121	3	20328–20330	4291	March 1955	—
SW1200	122–125	4	20331–20334	4292	March 1955	—
SW1200	126	1	20335	4293	March 1955	—
SW1200	127–129	3	20320–20322	4290	July–August 1955	—
SW1200	130	1	21019	4327	January 1956	—
SW1200	131–132	2	21102–21103	4338	April 1956	—
SW1200	133–134	2	21100–21101	4335	April 1956	—
SW1200	135–140	6	21175–21180	4335	June–July 1956	Continued
SW1200	141	1	21181	4358	July 1956	—
SW1200	142–144	3	21433–21435	4358	July 1956	Continued
SW1200	145	1	22089	4358	July 1956	Continued
SW1200	146	1	22748	4373	February 1957	—
SW1200	147–148	2	22749–22750	4379	February 1957	—
SW1200	149–150	2	22751–22752	4380	February 1957	—
SW1200	151–162	12	22753–22764	4374	June–July 1957	—
SW1200	163–177	15	24027–24041	4410	December 1957–January 1958	—
FTA	6000A,D–6002A,D	6	1978–1983	E531	February–May 1944	—
FTA	6003A–6006A, 6003D–6006D	8	2557–2564	E611	July–October 1944	—
FTA	6007A,D–6010A,D	8	2836–2843	E636	December 1944–January 1945	The list prints 6007A–6010A, 6007–6010D
FTB	6000B,C–6002B,C	6	1984–1989	E532	February–May 1944	—
FTB	6003B–6006B, 6003C–6006C	8	2565–2572	E612	July–October 1944	—
FTB	6007B–6010B, 6007C–6010C	8	2844–2851	E636	December 1944–January 1945	—
F3A	6500A–6505A	6	3773–3778	E722	January 1947	—
F3A	6011A,D–6014A,D	8	3779–3786	E759	January 1947	—
F3A	6015A,D	2	4312–4313	E759	January 1947	Continued
F3A	6506A	1	4787	E722	April 1947	Continued
F3A	6503C–6506C, 6016A,D–6017A,D	8	6652–6659	E1018	October 1948	—
F3B	6500B,C–6504B,C	10	3787–3796	E722	January 1947	—
F3B	6505B,C	2	3872–3873	E722	January 1947	Continued
F3B	6011B,C–6015B,C	10	3874–3883	E759	January 1947	—
F3B	6506B,C	2	4788–4789	E722	April 1947	Continued
F7A	6507A,C, 6508A,C, 6501C, 6502C	6	7146–7151	E1040	April–May 1949	Nos. 6501C and 6502C reuse F3B numbers. No. 6507A is the locomotive in the photograph
F7A	6500C, 6509A,C–6512A,C	9	8731–8739	E1214	September 1949	No. 6500C reuses an F3B number. Rebuilt to an F9A in March 1956, order 8038, serial printed (8731). The repair list calls that rebuild an F3A. Same frame
F7A	6513A,C	2	10855–10856	6045	February 1950	—
F7A	6007A,D–6012A,D	12	10908–10919	6053	February 1950	These numbers reuse the FTA series
F7A	6013A,D–6018A,D	12	14252–14263	3092	May–June 1951	—
F7A	6019A,D–6020A,D	4	15672–15675	3134	December 1951	—
F7B	6510B–6512B	3	8740–8742	E1214	September 1949	—
F7B	6513B	1	10857	6045	February 1950	—
F7B	6007B,C–6012B,C	12	10920–10931	6053	February 1950	Nos. 6007B,C–6010B,C reuse the FTB series
F7B	6013B,C–6018B,C	12	14264–14275	3092	May–June 1951	—
F7B	6019B,C–6020B,C, 6050	5	15676–15680	3134	December 1951	—
F7B	6550	1	15683	3135	February 1952	—
FP7	6600–6601	2	15681–15682	3135	February 1952	—
F9A	6700A,C	2	19056–19057	3175	February 1954	—
F9A	6701A,C	2	21124–21125	3190	August 1956	—
F9A	6702A–6704A	3	22765–22767	3195	December 1956	A units only. The list does not show 6702C–6704C
F9A	7000A,D–7001A,D	4	19048–19051	3176	January 1954	—
F9A	7002A,D–7006A,D	10	19738–19747	3179	August–October 1954	—
F9A	7007A,D	2	20324–20325	3181	February 1955	—
F9A	7008A,D–7009A,D	4	20297–20300	3180	July–August 1955	—
F9A	7010A,D–7014A,D	10	21104–21113	3189	March 1956	—
F9A	7050A	1	18129	3186	February 1953	Demonstrator 975, sold on order 3186
F9B	6700B	1	19058	3175	February 1954	—
F9B	6701B	1	21126	3190	August 1956	—
F9B	7000B,C–7001B,C	4	19052–19055	3176	January 1954	—
F9B	7002B,C–7006B,C	10	19748–19757	3179	August–October 1954	—
F9B	7007B,C	2	20326–20327	3181	February 1955	—
F9B	7008B,C–7009B,C	4	20301–20304	3180	August 1955	—
F9B	7010B,C–7014B,C	10	21114–21123	3189	March 1956	—
GP7	550–551	2	10940–10941	6055	February 1950	—
GP7	552–553	2	14093–14094	5098	April 1951	—
GP7	554	1	14111	5098	April 1951	Continued
GP7	555–558	4	15687–15690	5154	March 1952	—
GP7	559	1	17479	5216	November 1952	—
GP7	560–563	4	19031–19034	5311	December 1953	—
GP7	564–568	5	19035–19039	5317	December 1953	—
GP7	569	1	19040	5318	December 1953	—
GP9	200–203	4	19544–19547	5342	June 1954	—
GP9	204–217	14	20336–20349	5386	February–March 1955	—
GP9	218–232	15	20305–20319	5384	June 1955	—
GP9	233–237	5	20370–20374	5384	June 1955	Continued
GP9	238–240	3	20641–20643	5384	August 1955	Continued
GP9	241–242	2	20644–20645	5403	August 1955	—
GP9	243	1	21020	5419	December 1955	—
GP9	244–245	2	21089–21090	5454	February 1956	—
GP9	246–254	9	21091–21099	5425	February 1956	—
GP9	255–260	6	21427–21432	5425	February 1956	Continued
GP9	261–268	8	21218–21225	5430	July 1956	—
GP9	269–274	6	21226–21231	5484	July 1956	—
GP9	275–284	10	21232–21241	5472	July 1956	—
GP9	285–304	20	22768–22787	5524	February 1957	—
GP9	305–316	12	22708–22719	5504	February 1957	—
GP9	317–344	28	22720–22747	5505	July–August 1957	—
GP9	345–350	6	24014–24019	5559	January 1958	—
GP9	351–357	7	24020–24026	5561	January 1958	The list prints 345–357. Nos. 345–350 are the previous order. Quantity follows serials 24020–24026
GP9	358–371	14	24048–24061	5560	June–September 1958	—
GP9	372–375	4	24472–24475	5560	April 1958	Continued
GP18	376–384	9	26008–26016	5621	June 1960	—
SD45	3600–3603	4	31951–31954	7890	July 1966	—
SD45	3604–3619	16	33025–33040	7978	April–May 1967	—
SD45	3620–3629	10	33900–33909	7094	April–May 1968	—

General Electric

General Electric built 44-ton No. 98 for the Northern Pacific. No. 99 (1st) was built for the Duluth Union Depot & Terminal as No. 5 and later carried a Northern Pacific number. The road locomotives were the U25Cs, the U28Cs, and the U33Cs. The U33Cs of July 1969 were the last new road locomotives before the merger.

Model	Road numbers	Qty	Serial	Order	Built	Notes
44-ton	98	1	28496	—	June 28, 1946	Center cab
44-ton	99 (1st)	1	15765	—	March 12, 1943	Built for the Duluth Union Depot & Terminal as No. 5. The list marks this number 99 (1st)
U25C	2500–2514	15	35035–35049	1821	May 20, 1964	—
U25C	2515–2529	15	35582–35596	1847	May–July 1965	The engine cell reads 7FDL16A. The list dates run from May 14 to July 22, 1965
U28C	2800–2801	2	35630–35631	1815	April 15, 1966	The weight cell reads 127 tons. The engine cell reads FDL16C
U28C	2802–2811	10	35882–35891	1815	April–July 1966	The weight cell reads 197 tons. The engine cell reads FDL16-B. The wheel-arrangement cell for No. 2810 reads C-c
U33C	3300–3309	10	37118–37127	1809	July 1969	—

Sources

Andre Kristopans, Electro-Motive production lists preserved at Utah Rails, for the Electro-Motive serials, order numbers, and build dates. The index was last updated on June 28, 2026. The Northern Pacific lines used here are on the 201A and 567 switcher list, last updated on July 24, 2018, the 567 road-switcher list, the freight-cab list, and the 40-series list. The freight-cab page was last updated on September 10, 2014. The road-switcher page and the 40-series page were last updated on September 11, 2014. The passenger-unit list, last updated on September 11, 2014, has no Northern Pacific lines.
The Kristopans trade-in page, last updated on September 12, 2014, for SW900 No. 100, built against an NW trade-in.
The Kristopans repair page, last updated on September 12, 2014, for the March 1956 rebuild of No. 6500C.
Robert H. Lehmuth, locomotive builder lists preserved at Utah Rails, for the Alco, Baldwin, and General Electric rows. The Utah Rails page was last updated on January 31, 2025. The note there records that Lehmuth died in August 2019 and that the status of the lists he was offering is not known. The volumes used are the Alco diesel volumes, the Baldwin internal-combustion volume, the General Electric volumes, and the Fairbanks-Morse volume. The Fairbanks-Morse volume has no Northern Pacific lines.

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