Baltimore & Ohio 4-4-4 "Jubilee" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class Lady Baltimore / J-1 (Locobase 112)

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

ClassLady Baltimore / J-1
Locobase ID112
RailroadBaltimore & Ohio (B&O)
Number in Class1
Road Numbers1
Number Built1
Valve GearWalschaert
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 / 24.10
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 Volume228.50
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation21,630
Same as above plus superheater percentage25,740
Same as above but substitute firebox area for grate area217,830
Power L151,139
Power MT2259.36

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Wes Barris