Baltimore & Ohio 0-4-0 "Switcher" Locomotives in the USA


Class Details by Steve Llanso of Sweat House Media

Class Andrew Jackson (Locobase 1019)

Data from Alvin F Staufer's Baltimore & Ohio Steam and Electric Locomotives (Medina, Ohio) supplied by Allen Stanley from his extensive Rail Data Exchange May 2005.

Source (Kinert, 1962) says the B&O built at least 16 "Grasshoppers", which had vertical boilers and a walking-beam drive train.

Traveller, Arabian, Mercury, and George Washington were built by Davis and Gartner at the Mount Clare shops. James Monroe, John Quincy Adams, Thomas Jefferson, and James Madison were constructed by Gillingham and Winans in 1835, followed by Andrew Jackson, John Hancock, Phineas Davis, Martin Van Buren, and George Clinton in 1836.

Staufer's data is for the John Hancock.


Class York (Locobase 1017)

Data from Alvin F Staufer's Baltimore & Ohio Steam and Electric Locomotives (Medina, Ohio) supplied by Allen Stanley from his extensive Rail Data Exchange May 2005. See also Kinert, 1962. (Thanks to Chris Hohl for his 3 December 2018 email pointing out the tender's capacities.)

One of the contestants for the nascent Baltimore & Ohio's automotive engine, this Phineas Davis design featured a tall boiler centered on a platform and carried by two low-drivered axles. The stack came straight out of the top. Comstock (1971) published a cross-section drawing that shows two pipes leading from the firebox to the stack. Hot gases boiled water in the thin jacket and in a shallow drum (known as a "cheese") suspended from the firebox top.

After experimenting with direct drive for his two vertical cylinders, Davis resorted to a geared system.

Principal Dimensions by Steve Llanso of Sweat House Media
ClassAndrew JacksonYork
Locobase ID1019 1017
RailroadBaltimore & Ohio (B&O)Baltimore & Ohio (B&O)
CountryUSAUSA
Whyte0-4-00-4-0
Number in Class91
Road Numbers
GaugeStdStd
Number Built91
BuilderseveralPhineas Davis
Year18361831
Valve Gear
Locomotive Length and Weight
Driver Wheelbase (ft / m) 4.08 / 1.244 / 1.22
Engine Wheelbase (ft / m) 4.08 / 1.2410.48 / 3.19
Ratio of driving wheelbase to overall engine wheebase1 0.38
Overall Wheelbase (engine & tender) (ft / m) 4.08 / 1.24
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)28,900 / 13,10913,540 / 6142
Engine Weight (lbs / kg)28,900 / 13,10913,540 / 6142
Tender Loaded Weight (lbs / kg)4660 / 2114
Total Engine and Tender Weight (lbs / kg)18,200 / 8256
Tender Water Capacity (gals / ML)300 / 1.14104
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT) 0.40 / 0.40 0.60
Minimum weight of rail (calculated) (lb/yd / kg/m)24 / 1211 / 5.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)35 / 88930 / 762
Boiler Pressure (psi / kPa)75 / 5.20115 / 7.90
High Pressure Cylinders (dia x stroke) (in / mm)12" x 22" / 305x5605.25" x 12" / 133x305
Tractive Effort (lbs / kg)5770 / 2617.231078 / 488.97
Factor of Adhesion (Weight on Drivers/Tractive Effort) 5.0112.56
Heating Ability
Firebox Area (sq ft / m2)29.10 / 2.7028 / 2.60
Grate Area (sq ft / m2)11 / 1.02 6.75 / 0.63
Evaporative Heating Surface (sq ft / m2)204 / 18.96100 / 9.29
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)204 / 18.96100 / 9.29
Evaporative Heating Surface/Cylinder Volume70.84332.60
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation825776
Same as above plus superheater percentage825776
Same as above but substitute firebox area for grate area21833220
Power L15314590
Power MT81.011494.71

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