The firebox heating surface includes five arch tubes of 54 sq ft (5.02 sq m). HP cylinders admitted steam through 14" (356 mm) piston valves; the LP cylinders used slide valves.
In the east, about the only job for which these big all-adhesion Mallets were suited was yard switching and that's what the B&M wanted them to do.
After seven years of work at the Mechanicville hump yard, however, the B&M sold them to the Bingham & Garfield copper mining road in Utah in September 1929 as their 107-108. The later B&G diagram shows a reduction of 8 small tubes in the boiler for the 800, 13 for the 801. Arch tube area was recalculated as 60 sq ft (5.57 sq m). The changes aggregated to an evaporative heating surface area in the 800 of 5,215 sq ft (484.49 sq m) and 5,147 sq ft (478.17 sq m) in the 801.
Pressure setting rose to 230 psi ( 15.8 bar). Grate measurements remained the same, but the grate area measurement showed as 77 sq ft (7.15 sq m), the reduction possibly due to the adoption of a Rosebud grate (See Locobase 6941 for a longer description of the grate design.). New appliances included Alco's Type G power reverse gear, Elesco's Type CA1 feed water heater, and Elesco's Type HA superheater.
Engine weight grew to 474,100 lb (215,048 kg) and the engines now trailed tenders weighing 219,100 lb (99,382 kg). Water capacity increased to 12,000 US gallons (45,420 litres) and "slack" coal capacity amounted to 38,100 lb (17,282 kg).
801 received its last Class 3 overhaul in March 1947. 800's came a year later in March 1948. The B&G's operations ceased in April 1948 and the ICC approved its application to abandon the line in June. It's likely that the two locomotives were scrapped not long after.
(The Copperton low line, which began service on 1 April 1948, used electric locomotives. )
|Principal Dimensions by Steve Llanso of Sweat House Media|
|Railroad||Boston & Maine (B&M)|
|Number in Class||2|
|Locomotive Length and Weight|
|Driver Wheelbase (ft / m)||14.75 / 4.50|
|Engine Wheelbase (ft / m)||40.29 / 12.28|
|Ratio of driving wheelbase to overall engine wheebase||0.37|
|Overall Wheelbase (engine & tender) (ft / m)||77.04 / 23.48|
|Axle Loading (Maximum Weight per Axle) (lbs / kg)||59,600 / 27,034|
|Weight on Drivers (lbs / kg)||465,000 / 210,921|
|Engine Weight (lbs / kg)||474,100 / 215,048|
|Tender Loaded Weight (lbs / kg)||189,500 / 85,956|
|Total Engine and Tender Weight (lbs / kg)||663,600 / 301,004|
|Tender Water Capacity (gals / ML)||11,000 / 41.67|
|Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)||13 / 11.80|
|Minimum weight of rail (calculated) (lb/yd / kg/m)||97 / 48.50|
|Geometry Relating to Tractive Effort|
|Driver Diameter (in / mm)||51 / 1295|
|Boiler Pressure (psi / kPa)||220 / 15.20|
|High Pressure Cylinders (dia x stroke) (in / mm)||26" x 28" / 660x711|
|Low Pressure Cylinders (dia x stroke) (in / mm)||40" x 28" / 1016x711|
|Tractive Effort (lbs / kg)||97,578 / 44260.69|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||4.77|
|Firebox Area (sq ft / m2)||371 / 34.47|
|Grate Area (sq ft / m2)||80.30 / 7.46|
|Evaporative Heating Surface (sq ft / m2)||5298 / 492.20|
|Superheating Surface (sq ft / m2)||1367 / 127|
|Combined Heating Surface (sq ft / m2)||6665 / 619.20|
|Evaporative Heating Surface/Cylinder Volume||307.92|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||17,666|
|Same as above plus superheater percentage||21,376|
|Same as above but substitute firebox area for grate area||98,760|