Flexible-beam eight-coupled engines from Baldwin enjoyed some success beginning in the mid-1840s (see Locobase 1022 for a description of this setup). Colburn pointed out two advantages to the layout. The "hind truck" was under the firebox and, "while the wheelbase is thus limited, an equal distribution of weight is obtained." Total heating surface area probably came to about 775 sq ft (72 sq m).
The second of the five was sent to the North Pennsylvania with the name Carbon. It was scrapped in 1873. The 44 was scrapped in January 1876. Both of the later engines gained some tractive effort when they rebuilt in the mid-1860s with cylinders of a longer stroke of 22" (559 mm) and 48" (1,219 mm) drivers. Both were sold in 1870 and 1869, respectively, to the Huntingdon & Broad Top Mountain.
http://prr.railfan.net/documents/MotivePowerDevelopment/p15.html (visited 6 Jan 2005), which is a reprint of a collection of articles by Paul Warner originally published in Baldwin Magazine in 1924. Works numbers were 573-576. Boiler pressure is an estimate.
This class was made up of Baldwin's flexible-beam truck locomotives Quaker City (94), Iron City (95), Pennsylvania (97), and Bedford (98). Ex-Quaker City was rebuilt as a 2-6-0 in November 1865 and scrapped in August 1879. 97-98 were both rebuilt as 2-8-0T tank engine in 1864 and scrapped in 1869.
|Specifications by Steve Llanso of Sweat House Media|
|Railroad||Pennsylvania (PRR)||Pennsylvania (PRR)|
|Number in Class||5||4|
|Road Numbers||44, 16, 45, 128-129||94-95, 97-98|
|Builder||M W Baldwin & Co||M W Baldwin & Co|
|Locomotive Length and Weight|
|Ratio of driving wheelbase to overall engine wheebase|
|Overall Wheelbase (engine & tender)|
|Axle Loading (Maximum Weight per Axle)|
|Weight on Drivers||66000 lbs|
|Engine Weight||66000 lbs|
|Tender Light Weight|
|Total Engine and Tender Weight|
|Tender Water Capacity|
|Tender Fuel Capacity (oil/coal)|
|Minimum weight of rail (calculated)||0||28 lb/yard|
|Geometry Relating to Tractive Effort|
|Boiler Pressure||90 psi||90 psi|
|Cylinders (dia x stroke)||18" x 20"||19" x 22"|
|Tractive Effort||11528 lbs||14129 lbs|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||4.67|
|Grate Area||18.66 sq. ft|
|Evaporative Heating Surface|
|Combined Heating Surface||0||0|
|Evaporative Heating Surface/Cylinder Volume|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||1679||0|
|Same as above plus superheater percentage||1679||0|
|Same as above but substitute firebox area for grate area||0||0|