Boston & Maine Mountains

The Boston & Maine Railroad's last purchase of steam locomotives was its Class R-1 "Mountains" built by the Baldwin Locomotive Works. These eighteen 4-8-2s (road number 4100 through 4117) each weighed 416,100 lbs and were some of the heaviest 4-8-2s built in the United States. They had 28 x 31 cylinders, 73" drivers, a 240 psi boiler pressure and a tractive effort of 67,900 pounds.

Each of the B&M "Mountains" carried a name in addition to its road number. These names were selected from contest entries and were assigned as noted below.

Thirteen of these locomotives (road numbers 4100 through 4112) were sold to the B&O in 1947 and the remaining five were retired in 1955 and 1956 and were scrapped shortly after.

Road No.	Locomotive Name	Class	Year Built	Disposition
4100	Endurance	R-1a	1935	Sold to B&O
4101	Hanah Dustin	R-1a	1935	Sold to B&O
4102	Cardigan	R-1a	1935	Sold to B&O
4103	Oliver Wendell Holmes	R-1a	1935	Sold to B&O
4104	Bee and Emma	R-1a	1935	Sold to B&O
4105	Powwow River	R-1b	1937	Sold to B&O
4106	Little John	R-1b	1937	Sold to B&O
4107	Intrepid	R-1b	1937	Sold to B&O
4108	Lily Pons	R-1b	1937	Sold to B&O
4109	The Bumble Bee	R-1b	1937	Sold to B&O
4110	Calvin Coolidge	R-1c	1939	Sold to B&O
4111	Trojan	R-1c	1939	Sold to B&O
4112	The Swallow	R-1c	1939	Sold to B&O
4113	Black Arrow	R-1d	1941	Scrapped 1956
4114	Invincible	R-1d	1941	Scrapped 1955
4115	Casey Jones	R-1d	1941	Scrapped 1955
4116	American Progress	R-1d	1941	Scrapped 1955
4117	Hercules	R-1d	1941	Scrapped 1955

Specifications for Class R-1
Wheel Arrangement:	4-8-2
Length:	105' - 8"
Drivers:	73" dia
Weight on Drivers:	269,300 lbs
Total Locomotive Weight:	416,100 lbs
Locomotive & Tender Weight:	788,800 lbs
Grate Area:	79 sq ft
Cylinders:	(2) 28" dia. x 31" stroke
Boiler Pressure:	240 psi
Tractive Effort:	67,900 lbs
Tender Capacity:	20,000 gals. of water and 21 tons of coal.

Boston & Maine Mountains

Photos

References