Data from Locomotive Cyclopedia 1930. See also the Salamanca (NY) Republican Press's description of these engines quoted in "New Engines are Awe-Inspiring," Buffalo, Rochester & Pittsburgh Railway Employes [sic] Magazine, Vol 6, No 4 (April 1918), pp. 45-48 . (Thanks to Chris Hohl for noting the valve gear ID.) Works numbers 58017-58022 in March 1918, 58498 in April and 64617-64618 in August 1923.
According to a New York State legislative report from 1918 (Legislative Document By New York (State) Legislature, J.B. Lyon Co. New York (State), 1919 v.9 no.14 pt.1 , the BR&P was planning to buy 15 of these for just over $1 million. Seven were produced in April 1918 and two more in September 1923.
Other than the Triplexes built for the Erie and the Virginian and the latter's AE 2-10-10-2s (Locobase 417), these Mallet compounds had the most total cylinder volume of any built-from-scratch locomotive. They also had enormous 16" (406 mm) piston valves serving the HP cylinders. They were rated at 140 empties or 70 loaded cars over the Clarion Junction-Freeman section, which included a 58 ft/mile (1.1%) that went on for 17 miles (27.4 km).
The Salamanca paper described these engines as "one of the biggest locomotives in the world-a veritable giant, to stand beside which turns one's thoughts towards Gulliver's land of Brobdingnag." It points out that wrangling such a beast required a power reverse [Ragonnet & Mellin] and automatic stoker [Duplex]. About the latter, a representative of Pittsburgh's Locomotive Stoker Company, William Crowe, claimed that it raised the efficiency of the engine from 55 or 60 up to 90 or 95 percent while reducing the fireman's labor by 85 percent.
(The Buffalo, Rochester & Pittsburgh was an independent railroad until bought out by the B&O in 1932. In B&O service, these Mallets were known as EE-2. )
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | XX/EE-2 |
| Locobase ID | 314 |
| Railroad | Buffalo, Rochester, & Pittsburgh (B&O) |
| Country | USA |
| Whyte | 2-8-8-2 |
| Number in Class | 9 |
| Road Numbers | 800-808/7316-7322 |
| Gauge | Std |
| Number Built | 9 |
| Builder | Alco-Brooks |
| Year | 1918 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 31 / 9.45 |
| Engine Wheelbase (ft / m) | 57.42 / 17.50 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.54 |
| Overall Wheelbase (engine & tender) (ft / m) | 91.40 / 27.86 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 502,500 / 227,930 |
| Engine Weight (lbs / kg) | 575,000 / 260,816 |
| Tender Loaded Weight (lbs / kg) | 205,600 / 93,259 |
| Total Engine and Tender Weight (lbs / kg) | 780,600 / 354,075 |
| Tender Water Capacity (gals / ML) | 12,000 / 45.45 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 14 / 13 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 105 / 52.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 57 / 1448 |
| Boiler Pressure (psi / kPa) | 200 / 1380 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 28" x 32" / 711x813 |
| Low Pressure Cylinders (dia x stroke) (in / mm) | 44" x 32" / 1118x813 |
| Tractive Effort (lbs / kg) | 106,514 / 48314.00 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.72 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 303 - 2.25" / 57 |
| Flues (number - dia) (in / mm) | 55 - 5.5" / 140 |
| Flue/Tube length (ft / m) | 24 / 7.32 |
| Firebox Area (sq ft / m2) | 479 / 44.50 |
| Grate Area (sq ft / m2) | 99.20 / 9.22 |
| Evaporative Heating Surface (sq ft / m2) | 6625 / 615.71 |
| Superheating Surface (sq ft / m2) | 1632 / 151.67 |
| Combined Heating Surface (sq ft / m2) | 8257 / 767.38 |
| Evaporative Heating Surface/Cylinder Volume | 290.52 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 19,840 |
| Same as above plus superheater percentage | 23,808 |
| Same as above but substitute firebox area for grate area | 114,960 |
| Power L1 | 7999 |
| Power MT | 280.75 |