Boston & Maine Steam Roster (Post 1900)

Published: May 30, 2026

The Boston & Maine Railroad (B&M) operated one of New England’s most varied steam locomotive rosters from the late 19th century until the mid-1950s. At its peak in the early 20th century, the B&M rostered hundreds of steam engines tailored to the region’s dense passenger traffic, commuter services, and challenging secondary lines with tight curves and grades. The fleet emphasized reliable, versatile power rather than massive mainline locomotives, relying heavily on builders like American Locomotive Company (ALCO) subsidiaries—Manchester, Schenectady, and Brooks—with additional units from Baldwin and later Lima.

Boston & Maine 2-6-0 #1402 (Class B-15b) leads a local freight southbound out of Peterborough, New Hampshire on the morning of January 8, 1956. Steven Payne photo.

Switchers formed the backbone of yard and local work. The G-class 0-6-0s (e.g., G-10 200–309 built 1903–1910 by Manchester; G-11a 400–429, 1911–1913) and G-11b 430–452 (Brooks, 1916) handled industrial trackage. Heavier 0-8-0s included H-2a USRA copies (610–631, Alco 1922) and H-3 series (Baldwin and Alco, 1928–1929) for bigger yard jobs. These compact engines, with 52-inch drivers and modest cylinder sizes, excelled in tight clearances.

For road service, the B-15/B-15a 2-6-0 Moguls dominated. Roughly 140 units (1360–1499, Manchester ALCO 1903–1910) provided flexible power for mixed trains and locals. Many received superheaters later, extending their lives into the 1950s. The K-class 2-8-0 Consolidations offered more muscle: K-7 (2360–2429, Alco 1905–1911), K-8b (2640–2709, Baldwin 1913), and K-8c (2710–2734, Brooks 1916) hauled freight across the system with 61-inch drivers and 24x30-inch cylinders in later variants.

Passenger and fast freight duties fell to 4-4-0 Americans (A-41f series, Manchester 1909–1911), 4-4-2 Atlantics (J-1b 3220–3244, 1908–1909), and especially 4-6-2 Pacifics. The P-1 through P-2 series (Alco, 1910–1913) featured 73-inch drivers; the pinnacle came with the elegant P-4a/b heavy Pacifics (3710–3719, Lima 1934 and 1937) boasting 80-inch drivers, 260 psi boilers, and striking names like Constitution (3713, the sole survivor, preserved). These handled named trains such as the Minute Man.

Freight power included 2-10-2 Santa Fe types (S-1a/b, Alco 1920–1923, 3000–3029) for heavy drags and 25 Lima 2-8-4 Berkshires (T-1a/b, 1928–1929). The final steam order comprised 18 Baldwin 4-8-2 Mountains (R-1a–d, 1935–1941) with large 73-inch drivers and high-capacity tenders for fast freight and passenger work.

B&M steam peaked with dark green livery and gold lettering before shifting to experimental schemes. Postwar dieselization accelerated retirements; most steam vanished by 1955–1957, with the last active engines scrapped shortly after. A few units found second lives or preservation, such as 0-6-0 No. 410 in Lowell, Massachusetts. The roster reflected the B&M’s adaptation to regional demands until the diesel era fully supplanted it.

Roster (Post 1900)

Wheel Arrangement	Class	Road Number(s)	Quantity	Builder(s)	Completion Date	Retirement Date	Notes
0-6-0	G-9-b	160-185 (not sequential)	18	Manchester (Alco)	1899-1901	1926-1927	-
0-6-0	G-9-c	190-199	10	Baldwin	1902-1903	1926-1928	-
0-6-0	G-10	200-309	110	Manchester (Alco)	1903-1910	1927-1949	-
0-6-0	G-11	400-429	30	Manchester (Alco)	1911, 1913	1947-1953	-
0-6-0	G-11-b	430-452	23	Brooks (Alco)	1916	1953-1955	-
0-8-0	H-1-a	600, 601	2	Schenectady (Alco)	1916	-	Transferred to Portland Terminal in 1935.
0-8-0	H-2-a	610-631	22	Schenectady (Alco)	1922	1946-1955	Sold to the Bangor & Aroostok (4) and Maine Central (1) in 1946.
0-8-0	H-3	640-654	15	Baldwin	1927, 1929	1951-1953	-
0-8-0	M-2-a	800-801	2	Schenectady (Alco)	1922	-	Sold to Bingham & Garfield in 1929.
0-6-0	G-11-c	830-832	4	Schenectady (Alco)	1917-1920	1952-1953	Transferred from Portland Terminal in 1951.
4-4-0	A-40-b	944-949	6	Manchester	1900	1926-1927	ex-Fitchburg Railroad
4-4-0	A-41	950-1029	77	Manchester (Alco), Baldwin	1900-1911	1926-1947	-
4-6-0	C-20	1057-1060/2076-2079	4	Baldwin	1900	1928	ex-Fitchburg (Alco)
4-4-0	A-45	1133-1136	4	Schenectady (Alco)	1900	1926-1935	ex-Fitchburg Railroad
4-4-0	A-46	1170-1173	4	Baldwin	1900	1926-1929	-
2-6-0	B-15	1360	137	Manchester (Alco), Schenectady (Alco)	1903-1910	1927-1955	-
4-6-0	C-15-c	2020-2025	6	Rhode Island (Alco)	1900	1927-1928	-
4-6-0	C-17	2060-2064	5	Rhode Island (Alco)	1900	1927-1928	-
4-6-0	C-21	2100-2129 (not sequential)	26	Schenectady (Alco)	1904-1906	1935-1937	-
2-8-0	K-5	2310-2343	34	Schenectady (Alco)	1901-1902	1926-1936	-
2-8-0	K-6	2350-2359	10	Schenectady (Alco)	1901-1902	1928-1936	Cross compound consolidations that were simpled by the Billerica Shops between 1910-1919.
2-8-0	K-7	2360-2429	66	Schenectady (Alco)	1905-1911	1928-1955	-
2-8-0	K-8	2600-2734	135	Baldwin, Schenectady (Alco), Brooks (Alco)	1911-1916	1937-1954	Two were sold to the Bangor & Aroostook in 1946.
4-8-0	L-1-a	2900-2909	10	Schenectady (Alco)	1899	1926	ex-Fitchburg Railroad, simpled in 1904
4-8-0	L-1-b	2910-2917	8	Rhode Island	1900	1926	ex-Fitchburg Railroad, simpled 1904
2-6-6-2	M-1	3000-3003	4	Schenectady (Alco)	1910	-	Sold to the Maine Central between 1911-1912.
2-10-2	S-1-a	3000-3019	20	Schenectady (Alco)	1920	1946-1949	Eleven examples were rebuilt as S-1-c in 1940 for light branch line service. Eight examples were sold to Maine Central (651-658) between 1936-1947.
2-10-2	S-1-b	3020-3029	10	Schenectady (Alco)	1923	1940-1948	-
4-4-2	J-1	3204-3244	41	Schenectady (Alco), Manchester (Alco)	1902-1909	1927-1952	-
4-6-2	P-1	3600-3611	12	Schenectady (Alco)	1910	1938-1952	-
4-6-2	P-2	3620-3689	70	Schenectady (Alco)	1911-1916	-1956	-
4-6-2	P-5-a	3696-3699	4	Brooks (Alco)	1924	1951-1952	ex-Delaware, Lackawanna & Western
4-6-2	P-3-a	3700-3709	10	Schenectady (Alco)	1923	1952-1955	-
4-6-2	P-4	3710-3719	10	Lima	1934, 1937	1953-1954	-
2-8-4	T-1	4000-4024	25	Lima	1928-1929	1948-1955	Ten examples were sold to SP and seven to the Santa Fe in 1945.
4-8-2	R-1	4100-4117	18	Baldwin	1935-1941	1955-1956	4100-4112 sold to the B&O in 1947.

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Boston & Maine Steam Roster (Post 1900)

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Roster (Post 1900)