Baltimore & Ohio 4-4-4 "Jubilee" Locomotives of 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 Raildata collection. (Thanks to Chris Hohl's 20 April 2013 email for valve gear information and for alerting me to the proper designation for this engine.)

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.

Specifications by Steve Llanso of Sweat House Media
ClassLady Baltimore / J-1
Locobase ID112
RailroadBaltimore & Ohio (B&O)
Number in Class1
Road Numbers1
Number Built1
BuilderB & O
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase 7.42'
Engine Wheelbase35.46'
Ratio of driving wheelbase to overall engine wheebase 0.21
Overall Wheelbase (engine & tender)75.87'
Axle Loading (Maximum Weight per Axle)50100 lbs
Weight on Drivers99800 lbs
Engine Weight217800 lbs
Tender Light Weight200000 lbs
Total Engine and Tender Weight417800 lbs
Tender Water Capacity11000 gals
Tender Fuel Capacity (oil/coal)14 tons
Minimum weight of rail (calculated)83 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter84"
Boiler Pressure350 psi
Cylinders (dia x stroke)17.5" x 28"
Tractive Effort30370 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.29
Heating Ability
Firebox Area523 sq. ft
Grate Area61.80 sq. ft
Evaporative Heating Surface1780 sq. ft
Superheating Surface415 sq. ft
Combined Heating Surface2195 sq. ft
Evaporative Heating Surface/Cylinder Volume228.35
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation21630
Same as above plus superheater percentage25740
Same as above but substitute firebox area for grate area217830
Power L151107
Power MT2257.95


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