Data from B&O Staufer Diagrams supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. (Thanks to Chris Hohl's 20 April 2013 email for valve gear information and for alerting me to the proper designation for this engine and for his 22 September 2017 email reporting unlikely boiler pressure values for 177 entries. A Locobase macro caused the error .)
This unusual locomotive was designed to be a lightweight engine along the lines of successful British light passenger types. The cylinder dimensions are modest, the water-tube boiler pressure relatively high at 350 psi. The tall drivers were worthy of note.
Describing the boiler takes some patience. The small number of fire tubes and flues constituted only part of the heating surface area. The water-tube firebox consisted of 146 2 1/2" (63.5 mm) tubes each measuring 5 feet 3 inches (1.6 metres) long.
The exposed Walschaerts valve gear is all-American. The engine was one of a kind. Although it was operated both on the B&O and on the Alton, it was not a great success. The factor of adhesion alone suggests how slippery this engine could be.
Principal Dimensions by Steve Llanso of Middle Run Media | |
---|---|
Class | Lady Baltimore / J-1 |
Locobase ID | 112 |
Railroad | Baltimore & Ohio (B&O) |
Country | USA |
Whyte | 4-4-4 |
Number in Class | 1 |
Road Numbers | 1 |
Gauge | Std |
Number Built | 1 |
Builder | B&O |
Year | 1934 |
Valve Gear | Walschaert |
Locomotive Length and Weight | |
Driver Wheelbase (ft / m) | 7.42 / 2.26 |
Engine Wheelbase (ft / m) | 35.46 / 10.81 |
Ratio of driving wheelbase to overall engine wheelbase | 0.21 |
Overall Wheelbase (engine & tender) (ft / m) | 75.87 / 23.13 |
Axle Loading (Maximum Weight per Axle) (lbs / kg) | 50,100 / 22,725 |
Weight on Drivers (lbs / kg) | 99,800 / 45,269 |
Engine Weight (lbs / kg) | 217,800 / 98,793 |
Tender Loaded Weight (lbs / kg) | 200,000 / 90,719 |
Total Engine and Tender Weight (lbs / kg) | 417,800 / 189,512 |
Tender Water Capacity (gals / ML) | 11,000 / 41.67 |
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 14 / 13 |
Minimum weight of rail (calculated) (lb/yd / kg/m) | 83 / 41.50 |
Geometry Relating to Tractive Effort | |
Driver Diameter (in / mm) | 84 / 2134 |
Boiler Pressure (psi / kPa) | 350 / 2410 |
High Pressure Cylinders (dia x stroke) (in / mm) | 17.5" x 28" / 445x711 |
Tractive Effort (lbs / kg) | 30,370 / 13775.62 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.29 |
Heating Ability | |
Tubes (number - dia) (in / mm) | 77 - 2.25" / 57 |
Flues (number - dia) (in / mm) | 18 - 5.5" / 140 |
Flue/Tube length (ft / m) | 17.75 / 5.41 |
Firebox Area (sq ft / m2) | 523 / 48.59 |
Grate Area (sq ft / m2) | 61.80 / 5.74 |
Evaporative Heating Surface (sq ft / m2) | 1780 / 165.37 |
Superheating Surface (sq ft / m2) | 415 / 38.55 |
Combined Heating Surface (sq ft / m2) | 2195 / 203.92 |
Evaporative Heating Surface/Cylinder Volume | 228.50 |
Computations Relating to Power Output (More Information) | |
Robert LeMassena's Power Computation | 21,630 |
Same as above plus superheater percentage | 25,740 |
Same as above but substitute firebox area for grate area | 217,830 |
Power L1 | 51,139 |
Power MT | 2259.36 |