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 12,769
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 Wheelbase (ft)13.5011.25
Engine Wheelbase (ft)24.3320.75
Ratio of driving wheelbase to overall engine wheebase 0.55 0.54
Overall Wheelbase (engine & tender) (ft)53.8743.08
Axle Loading (Maximum Weight per Axle) (lbs)38,800
Weight on Drivers (lbs)111,85058,000
Engine Weight (lbs)149,35075,000
Tender Loaded Weight (lbs)102,00040,000
Total Engine and Tender Weight (lbs)251,350115,000
Tender Water Capacity (gals)50002000
Tender Fuel Capacity (oil/coal) (gals/tons)10
Minimum weight of rail (calculated) (lb/yd)6232
Geometry Relating to Tractive Effort
Driver Diameter (in)6348
Boiler Pressure (psi)200160
High Pressure Cylinders (dia x stroke) (in)19" x 26"14" x 22"
Tractive Effort (lbs)25,32712,217
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.42 4.75
Heating Ability
Firebox Area (sq ft)16680.40
Grate Area (sq ft)28.2012.27
Evaporative Heating Surface (sq ft)2273910
Superheating Surface (sq ft)
Combined Heating Surface (sq ft)2273910
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 area33,20012,864
Power L176374284
Power MT451.59488.51