There were 4 R-1 classes comprising 18 engines -- all were named in contests.
R-1a 4100 Endurance
R-1a 4101 Hannah Dustin
R-1a 4102 Cardigan
R-1a 4103 Oliver Wendell Holmes
R-1a 4104 Bee & Emma
R-1b 4105 Powwow River
R-1b 4106 Little John
R-1b 4107 Intrepid
R-1b 4108 Lily Pons
R-1b 4109 Bumble Bee
R-1c 4110 Calvin Coolidge
R-1c 4111 Trojan
R-1c 4112 Swallow
R-1d 4113 Black Arrow
R-1d 4114 Invincible
R-1d 4115 Casey Jones
R-1d 4116 American Progress
R-1d 4117 Hercules
R-1a (4100-4104) and R-1b (4105-4109) weighed 416,100 lb.
R-1c (4105-09) weighed 414,960 lb.
R-1d (4113-4117) weighed 415,200 lb.
When fitted with 73-in drivers, R-1c had 67,000 lb of tractive effort. Coffin feedwater heaters concealed in the smokebox.
All were built by Baldwin, from 1937-1941. 4100-4112 were sold to the B&O in 1947 as the B&M dieselized.
| Specifications | |
|---|---|
| Class | R-1 |
| Locobase ID | 4410 |
| Railroad | Boston & Maine |
| Whyte | 4-8-2 |
| Road Numbers | 4100-4117 |
| Gauge | Std |
| Builder | Baldwin |
| Year | 1935 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase | 19.25' |
| Engine Wheelbase | 44.17' |
| 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 per yard of rail on which locomotive could run | 112.25 lb rail |
| Geometry Relating to Tractive Effort | |
| Driver Diameter | 73" |
| 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 |
| Heating Ability | |
| Firebox Area | 474 sq. ft |
| Grate Area | 79 sq. ft |
| Evaporative Heating Surface | 4544 |
| Superheating Surface | 1924 |
| Combined Heating Surface | 6468 |
| Evaporative Heating Surface/Cylinder Volume | 205.68 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 18960 |
| Same as above plus superheater percentage | 24599.93 |
| Same as above but substitute firebox area for grate area | 147599.55 |
| Power L1 | 32024.50 |
| Power MT | 1048.28 |
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