Data from 1923 and 1924 Maine Central locomotive diagrams supplied by Allen Stanley in May 2005 from his extensive Rail Data Exchange. (Thanks to Bob Marville for his 30 September 2019 reporting a visit to the Bartlett, NH roundhouse, comments from which appear below.) Works numbers were 48648-48649.
These compound Mallets were delivered to the Boston & Maine as oil-burning helpers on the Hoosac Tunnel section. Within six months, however, that portion was electrified and the quartet was sold to the Maine Central. The B&M saw them go with few regrets, according to Drury (1993). They had small drivers and an equally small firebox. (The improbable values shown in the specs are clearly visible in the MEC's diagram. The MEC's calculated tractive effort was 61,860 lb.)
On the MEC they served on the Crawford Notch grade in New Hampshire. Within a year they'd been converted to coal burning. Bob Marville's visit on 28 September 2019 included a conversation with Cameron Sargent and Pete Davis, who he desribed as "part of the group restoring this gem [the roundhouse]." One of the features Sargent and Davis showed Marville were "where two stalls of the roundhouse had been extended to accommodate the mallet locomotives."
Despite the revised accommodations, the pair were rendered redundant by the introduction of 2-8-2s and the four worked only sporadically for years. The three unsuperheated engines were scrapped in 1929, while 1204, which had been superheated during repairs following an accident, lingered until 1934.
Principal Dimensions by Steve Llanso of Middle Run Media | |
---|---|
Class | X |
Locobase ID | 6529 |
Railroad | Maine Central (MEC) |
Country | USA |
Whyte | 2-6-6-2 |
Number in Class | 4 |
Road Numbers | 1201-1204 |
Gauge | Std |
Number Built | 4 |
Builder | Alco-Schenectady |
Year | 1910 |
Valve Gear | Walschaert |
Locomotive Length and Weight | |
Driver Wheelbase (ft / m) | 22 / 6.71 |
Engine Wheelbase (ft / m) | 48.25 / 14.71 |
Ratio of driving wheelbase to overall engine wheelbase | 0.46 |
Overall Wheelbase (engine & tender) (ft / m) | 77 / 23.47 |
Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
Weight on Drivers (lbs / kg) | 262,000 / 118,841 |
Engine Weight (lbs / kg) | 308,000 / 139,707 |
Tender Loaded Weight (lbs / kg) | 148,300 / 67,268 |
Total Engine and Tender Weight (lbs / kg) | 456,300 / 206,975 |
Tender Water Capacity (gals / ML) | 7500 / 28.41 |
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 12 / 11 |
Minimum weight of rail (calculated) (lb/yd / kg/m) | 73 / 36.50 |
Geometry Relating to Tractive Effort | |
Driver Diameter (in / mm) | 61 / 1549 |
Boiler Pressure (psi / kPa) | 200 / 1380 |
High Pressure Cylinders (dia x stroke) (in / mm) | 22" x 30" / 559x762 |
Low Pressure Cylinders (dia x stroke) (in / mm) | 35" x 30" / 889x762 |
Tractive Effort (lbs / kg) | 58,011 / 26313.38 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.52 |
Heating Ability | |
Tubes (number - dia) (in / mm) | 406 - 2" / 51 |
Flues (number - dia) (in / mm) | |
Flue/Tube length (ft / m) | 21 / 6.40 |
Firebox Area (sq ft / m2) | 169 / 15.70 |
Grate Area (sq ft / m2) | 49 / 4.55 |
Evaporative Heating Surface (sq ft / m2) | 4444 / 413.01 |
Superheating Surface (sq ft / m2) | |
Combined Heating Surface (sq ft / m2) | 4444 / 413.01 |
Evaporative Heating Surface/Cylinder Volume | 336.58 |
Computations Relating to Power Output (More Information) | |
Robert LeMassena's Power Computation | 9800 |
Same as above plus superheater percentage | 9800 |
Same as above but substitute firebox area for grate area | 33,800 |
Power L1 | 3219 |
Power MT | 162.52 |