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
Class300
Locobase ID13,330
RailroadAlabama, Tennessee & Northern
CountryUSA
Whyte4-6-0
Number in Class3
Road Numbers300-302
GaugeStd
Number Built3
BuilderBaldwin
Year1911
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft)11.33
Engine Wheelbase (ft)22.17
Ratio of driving wheelbase to overall engine wheebase 0.51
Overall Wheelbase (engine & tender) (ft)49.04
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)96,000
Engine Weight (lbs)124,000
Tender Loaded Weight (lbs)80,000
Total Engine and Tender Weight (lbs)204,000
Tender Water Capacity (gals)4000
Tender Fuel Capacity (oil/coal) (gals/tons)5
Minimum weight of rail (calculated) (lb/yd)53
Geometry Relating to Tractive Effort
Driver Diameter (in)56
Boiler Pressure (psi)180
High Pressure Cylinders (dia x stroke) (in)18" x 26"
Tractive Effort (lbs)23,016
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.17
Heating Ability
Firebox Area (sq ft)150
Grate Area (sq ft)22.40
Evaporative Heating Surface (sq ft)1918
Superheating Surface (sq ft)
Combined Heating Surface (sq ft)1918
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 area27,000
Power L15853
Power MT403.24

Photos