Abilene & Southern / Augusta Southern 4-6-0 "Ten-wheeler" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 18 (Locobase 11724)

Data from Negative 7758, Degolyer Library collection of digitized Baldwin images, retrieved 26 October 2010 from http://digitalcollections.smu.edu/cdm4/item_viewer.php . See also DeGolyer, Volume 65, pp. 1+. (Thanks to Chris Hohl for his 4 November 2016 email noting the error (52" instead of 57") in the 18's driver diameter.) Works number was 54089 in November 1920.

This small, freight-drivered Ten-wheeler enjoyed a good measure of superheat, which also necessitated piston valves (9 1/2"/241 mm in diameter) for steam admission to the cylinders. It never strayed off the A & S rails, serving the line until its retirement in June 1947.

Class 73 (Locobase 13346)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 32, p.61 and Volume 45, pp. 177-178. See Locobase 6496 for a brief history of the August Southern. Baldwin works numbers were 33239 in March 1909 and 33630 in August.

Responsiveness to one's customers was important to continuing success for a capital-equipment supplier like Baldwin. Note here that the specifications applied to the 75 addressed some of the issues encountered in the 73 a few months earlier. The pilot was too short on the 73 "to properly protect loco. in case of cow or other obstruction on track." Parallel rod bushings needed to be changed to avoid having to drop the main rod brasses and large end to tighten the parallel rod bushings.

Of particular notice was the valve motion, which was "working badly." The problem lay in the lower connection below the crosshead, which had been made of "two flat bars held by bolts and cotters [cotter keys]." The motion had already shown 3/8"of lost motion. "Badly worn" bolts were to be replaced by case-hardened bolts to be"taper fit and secured by bolt and cotter". The AS sent the 73 to the Georgia Southern, where the valves "were reset and made square ...and engine works all right when down in corner." But, "when linked up one of four exhausts is barely perceptible. In resetting it was found necessary to alter the length of some of the levers."

Whew! Not a very good report card. 75 was to be better and 73 was to be "corrected."

When the Georgia & Florida took over the AS in 1919, it retained both Ten-wheelers, but renumbered them 173 and 175. The 175 was first to be sold from the G & F, going to the Tallulah Falls Railroad in April 1936 as their 77. 173 was sold in 1941 to the Virginia Blue Ridge. In 1942, the Army bought the 173 and renumbered it 6961. After its military service, the 6961 wound up with the Mead Corporation as their 200.

Specifications by Steve Llanso of Sweat House Media
Locobase ID11724 13346
RailroadAbilene & SouthernAugusta Southern
Number in Class12
Road Numbers1873, 75
Number Built12
BuilderBaldwinBurnham, Williams & Co
Valve GearWalschaertWalschaert
Locomotive Length and Weight
Driver Wheelbase11.33'11.33'
Engine Wheelbase21.58'22.17'
Ratio of driving wheelbase to overall engine wheebase 0.53 0.51
Overall Wheelbase (engine & tender)51.17'52.67'
Axle Loading (Maximum Weight per Axle)36300 lbs
Weight on Drivers94000 lbs95000 lbs
Engine Weight126000 lbs123000 lbs
Tender Light Weight100000 lbs90000 lbs
Total Engine and Tender Weight226000 lbs213000 lbs
Tender Water Capacity5000 gals4500 gals
Tender Fuel Capacity (oil/coal)10 tons tons
Minimum weight of rail (calculated)52 lb/yard53 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter57"57"
Boiler Pressure190 psi180 psi
Cylinders (dia x stroke)18" x 24"18" x 26"
Tractive Effort22032 lbs22612 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.27 4.20
Heating Ability
Firebox Area108 sq. ft152 sq. ft
Grate Area22.30 sq. ft22.40 sq. ft
Evaporative Heating Surface1327 sq. ft1717 sq. ft
Superheating Surface312 sq. ft
Combined Heating Surface1639 sq. ft1717 sq. ft
Evaporative Heating Surface/Cylinder Volume187.73224.22
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation42374032
Same as above plus superheater percentage50424032
Same as above but substitute firebox area for grate area2441927360
Power L1119385531
Power MT839.96385.07

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