Coudersport & Port Allegany 4-6-0 "Ten-Wheeler" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 5 (Locobase 13124)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 30, p. 204. Works number was 31127 in June 1907

When the C&PA was established as a narrow-gauge line in the early 1880s, it connected the two cities in the name with 17 miles of track. In 1896, the northwestern Pennsylvania line absorbed the Coudersport & Pine Creek. Turning eastward as well as westward, the line eventually reached Ulysses and measured 40 miles. In addition to harvesting the timber stands in the area, Coudersport took advantage of the natural gas deposits in the area to host several glass-making plants as well as the sawmills that processed the lumber. Both activities were later highlighted in a survey of sanitary conditions in Pennsylvania as contributing to the pollution of the main branch of the Allegheny, especially during low water.

Both industries declined as both timber and gas reserves shrank. The line was bobbed at both ends first by abandonment of the easternmost nine miles to Ulysses and later by a calamitous 1942 flood that washed away the westernmost nine miles. It struggled into the 1960s, was purchased by the Wellsville, Addison & Galeton in 1964, but finally closed in 1970.

A thread on Railnet -- [] -- features several reminiscences and notes that a 1944 Trains article on the line was titled "Pygmy Pennsylvanian".

The 5 served the C&PA until it was scrapped in 1943.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID13124
RailroadCoudersport & Port Allegany
Number in Class1
Road Numbers5
Number Built1
BuilderBurnham, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)13 / 3.96
Engine Wheelbase (ft / m)23.17 / 7.06
Ratio of driving wheelbase to overall engine wheelbase 0.56
Overall Wheelbase (engine & tender) (ft / m)48.50 / 14.78
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)104,000 / 47,174
Engine Weight (lbs / kg)131,000 / 59,421
Tender Loaded Weight (lbs / kg)80,000 / 36,287
Total Engine and Tender Weight (lbs / kg)211,000 / 95,708
Tender Water Capacity (gals / ML)4000 / 15.15
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)58 / 29
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)56 / 1422
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)19" x 26" / 483x660
Tractive Effort (lbs / kg)25,644 / 11631.94
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.06
Heating Ability
Tubes (number - dia) (in / mm)275 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)12.83 / 3.91
Firebox Area (sq ft / m2)152 / 14.13
Grate Area (sq ft / m2)31 / 2.88
Evaporative Heating Surface (sq ft / m2)1988 / 184.76
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1988 / 184.76
Evaporative Heating Surface/Cylinder Volume233.06
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation5580
Same as above plus superheater percentage5580
Same as above but substitute firebox area for grate area27,360
Power L15412
Power MT344.18

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Wes Barris