Alabama, Tennessee & Northern 4-6-0 "Ten-wheeler" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 300 (Locobase 13330)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 39, p. 163 and 48, p. 274. (Thanks to Chris Hohl for his 5 April 2015 email reporting the tender's fuel capacity.) Works numbers were 36291 in March 1911, 40667 in September 1913, and 40731 in October.

When the Agricola de Colombres had to forego the delivery of six Ten-wheelers in early 1911, Baldwin was able to place these orphans on several short lines in the United States.

Although the first of the three engines was originally credited to the Rock Island Southern as their 215, Baldwin's specification shows that it was instead sold to the AT&N in September 1912. (See Locobase 13178 for a short history of the AT&N.) Obviously, the size was a good fit for the AT&N as it paid for two new locomotives a year later.

The three engines served this Mississippi line for decades. See the Mississippi Rails site for a "stunning [their words, but appropriate]" photograph of the 302 at York and just out of the shops after a refit.

Specifications by Steve Llanso of Sweat House Media
Locobase ID13330
RailroadAlabama, Tennessee & Northern
Number in Class3
Road Numbers300-302
Number Built3
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase11.33'
Engine Wheelbase22.17'
Ratio of driving wheelbase to overall engine wheebase 0.51
Overall Wheelbase (engine & tender)49.04'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers96000 lbs
Engine Weight124000 lbs
Tender Light Weight80000 lbs
Total Engine and Tender Weight204000 lbs
Tender Water Capacity4000 gals
Tender Fuel Capacity (oil/coal)5 tons
Minimum weight of rail (calculated)53 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter56"
Boiler Pressure180 psi
Cylinders (dia x stroke)18" x 26"
Tractive Effort23016 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.17
Heating Ability
Firebox Area150 sq. ft
Grate Area22.40 sq. ft
Evaporative Heating Surface1918 sq. ft
Superheating Surface
Combined Heating Surface1918 sq. ft
Evaporative Heating Surface/Cylinder Volume250.47
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation4032
Same as above plus superheater percentage4032
Same as above but substitute firebox area for grate area27000
Power L15853
Power MT403.24


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