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.
There were four R-1 classes comprising 18 engines -- all were named in contests.
R-1a (1935) works numbers 61822-61826. Loaded weight was 416,100 lb.
4101 Hannah Dustin
4103 Oliver Wendell Holmes
4104 Bee & Emma
4105 Powwow River
R-1b (1937) works numbers 62033-62037. Loaded weight was 416,100 lb.
4106 Little John
4108 Lily Pons
4109 Bumble Bee
R-1c (1939) works numbers 62318-62319, 6232. Loaded weight 414,960 lb
4110 Calvin Coolidge
R-1d (1941) works numbers 62536-62540; weighed 415,200 lb.
4113 Black Arrow
4115 Casey Jones
4116 American Progress
When fitted with 73-in drivers, R-1c had 67,000 lb of tractive effort. Coffin feedwater heaters concealed in the smokebox.
4100-4112 were sold to the B&O in 1947as T-4 class 5650-5612 as the B&M dieselized. The last 5 remained in B & M service until 1955-1956.
|Specifications by Steve Llanso of Sweat House Media|
|Railroad||Boston & Maine (B&M)|
|Number in Class||18|
|Locomotive Length and Weight|
|Ratio of driving wheelbase to overall engine wheebase||0.44|
|Overall Wheelbase (engine & tender)||92.67'|
|Axle Loading (Maximum Weight per Axle)||68900 lbs|
|Weight on Drivers||269400 lbs|
|Engine Weight||416100 lbs|
|Tender Light Weight||372700 lbs|
|Total Engine and Tender Weight||788800 lbs|
|Tender Water Capacity||20200 gals|
|Tender Fuel Capacity (oil/coal)||22.5 tons|
|Minimum weight of rail (calculated)||112 lb/yard|
|Geometry Relating to Tractive Effort|
|Boiler Pressure||240 psi|
|Cylinders (dia x stroke)||28" x 31"|
|Tractive Effort||67918 lbs|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||3.97|
|Firebox Area||475 sq. ft|
|Grate Area||79 sq. ft|
|Evaporative Heating Surface||4511 sq. ft|
|Superheating Surface||1924 sq. ft|
|Combined Heating Surface||6435 sq. ft|
|Evaporative Heating Surface/Cylinder Volume||204.18|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||18960|
|Same as above plus superheater percentage||24648|
|Same as above but substitute firebox area for grate area||148200|