Tampa Northern / Timpson Northwestern 4-6-0 "Ten-wheeler" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 100 / 690 (Locobase 4997)

Data from 1929 SAL locomotive diagrams published on http://www.dnaco.net/~gelwood/other/sal--steambk.html . Works numbers were 31965-31966, 32007 in October 1907.

Middleweight Ten-wheelers taken into the Seaboard Air Line when the TN was absorbed. They lasted only until 1930, most likely because they were too small for more modern passenger equipment.

Class 4 (Locobase 12769)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 21, p. 216. See also Nancy Beck Young, "TIMPSON AND HENDERSON RAILWAY," Handbook of Texas Online (http://www.tshaonline.org/handbook/online/articles/eqt27), accessed June 24, 2011. Published by the Texas State Historical Association.Works number was 25504 in April 1905.

The T & N ran over a 8-mile line built by the Ragley Lumber Company from Timpson, Texas northwest to Ragley in Panola County. It was described in a 1904 Texas almanac as a "sawmill road", but it gained common carrier status in 1903. Little more than a year later, the line bought this single small Ten-wheeler.

In 1909, with 8 miles built, the T & N was renamed the Timpson & Henderson to reflected its greater ambition. The T & H bought another line built by Ragley that ran from Ragley to Pine Hill and extended it to Henderson, creating a 34-mile line.

The T & H lost its common-carrier status in 1923 and was abandoned, at which point the 4 was sold to Grogan Cochran Lumber.

Specifications by Steve Llanso of Sweat House Media
Class100 / 6904
Locobase ID4997 12769
RailroadTampa NorthernTimpson Northwestern
Number in Class21
Road Numbers100-102 / 690-6924
Number Built1
BuilderBurnham, Williams & CoBurnham, Williams & Co
Valve GearStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase13.50'11.25'
Engine Wheelbase24.33'20.75'
Ratio of driving wheelbase to overall engine wheebase 0.55 0.54
Overall Wheelbase (engine & tender)53.87'43.08'
Axle Loading (Maximum Weight per Axle)38800 lbs
Weight on Drivers111850 lbs58000 lbs
Engine Weight149350 lbs75000 lbs
Tender Light Weight102000 lbs40000 lbs
Total Engine and Tender Weight251350 lbs115000 lbs
Tender Water Capacity5000 gals2000 gals
Tender Fuel Capacity (oil/coal)10 tons tons
Minimum weight of rail (calculated)62 lb/yard32 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter63"48"
Boiler Pressure200 psi160 psi
Cylinders (dia x stroke)19" x 26"14" x 22"
Tractive Effort25327 lbs12217 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.42 4.75
Heating Ability
Firebox Area166 sq. ft80.40 sq. ft
Grate Area28.20 sq. ft12.27 sq. ft
Evaporative Heating Surface2273 sq. ft910 sq. ft
Superheating Surface
Combined Heating Surface2273 sq. ft910 sq. ft
Evaporative Heating Surface/Cylinder Volume266.41232.16
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation56401963
Same as above plus superheater percentage56401963
Same as above but substitute firebox area for grate area3320012864
Power L176374284
Power MT451.59488.51

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