The numbering in the AB&C is very confusing as to actual delivery order as the railroad's later numbering order represents an almost random sequence of earlier numbers. In any case, Baldwin delivered all of these Ten-wheelers (see Locobase 12947). The railroad superheated them later.
This set of mixed-traffic Ten-wheelers was the largest single class on the AB&A after they were delivered to the Altanta & Birmingham Construction Company. They were the first with 63" drivers and the first with 21" cylinders.
The AB & A later superheated the class; see Locobase 7858.
Baldwin's first set of Ten-wheelers for this alphabet road was supplied in singlets and pairs They were equipped with two 3" arch tubes in the firebox.
In 1905, financial interests organized the AB & A to purchase the Atlanta and Birmingham Railroad and to complete the long-sought direct link between the two cities. Even though it made much use of the failed Macon & Birmingham and did reach Birmingham, Alabama in 1908, the Bee Line was not much more successful. Its direct route actually connected Birmingham with the Atlantic Coast city of Brunswick, Georgia 287 miles away.
Its flimsy finances first forced a transparent reorganization as the Atlanta, Birmingham & Atlantic RailWAY in 1915, then foreclosure in 1922 and finally a further reorganization as the Atlanta, Birmingham & Coast (AB&C) Railroad. The latter, ABC route was controlled by the Atlantic Coast Line, which absorbed it entirely in 1946.
Three years after the AB&A bought their first Ten-wheelers from Baldwin (Locobase 8389), they came back for ten more. This decade of locomotives rolled on taller drivers and set the BP higher by 20 psi (1.38 bar). They were later superheated; see Locobase 8389.
Sometime after the 56 class came to the AB&C (Locobase 16155), they were superheated in a modest upgrade that also installed piston valves in universal steam chests and two 3"-diameter arch tubes. Some later had their cylinders bored out to 20".
|Specifications by Steve Llanso of Sweat House Media|
|Class||101||1601||40||56||56 - superheated|
|Railroad||Atlanta, Birmingham & Atlantic (AB&C)||Atlanta, Birmingham & Atlantic (AB&C)||Atlanta, Birmingham & Atlantic (AB&C)||Atlanta, Birmingham & Atlantic (AB&C)||Atlanta, Birmingham & Atlantic (AB&C)|
|Number in Class||24||24||16||10||26|
|Builder||AB&A||Burnham, Williams & Co||Burnham, Williams & Co||Burnham, Williams & Co||AB&A|
|Locomotive Length and Weight|
|Ratio of driving wheelbase to overall engine wheebase||0.57||0.57||0.55||0.55||0.60|
|Overall Wheelbase (engine & tender)||57.83'||55.75'||51.83'||51.83'||53.87'|
|Axle Loading (Maximum Weight per Axle)||48934 lbs||37246 lbs||37246 lbs||38333 lbs|
|Weight on Drivers||146800 lbs||134000 lbs||111740 lbs||111740 lbs||113000 lbs|
|Engine Weight||186200 lbs||179950 lbs||146340 lbs||146340 lbs||130000 lbs|
|Tender Light Weight||115000 lbs||120000 lbs||90000 lbs||90000 lbs||120000 lbs|
|Total Engine and Tender Weight||301200 lbs||299950 lbs||236340 lbs||236340 lbs||250000 lbs|
|Tender Water Capacity||6000 gals||5000 gals||4500 gals||4500 gals||6000 gals|
|Tender Fuel Capacity (oil/coal)||11 tons||tons||10 tons||10 tons||12 tons|
|Minimum weight of rail (calculated)||82 lb/yard||74 lb/yard||62 lb/yard||62 lb/yard||63 lb/yard|
|Geometry Relating to Tractive Effort|
|Boiler Pressure||200 psi||220 psi||180 psi||200 psi||200 psi|
|Cylinders (dia x stroke)||23" x 28"||21" x 28"||19" x 26"||19" x 26"||19" x 26"|
|Tractive Effort||37583 lbs||36652 lbs||22795 lbs||25327 lbs||23815 lbs|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||3.91||3.66||4.90||4.41||4.74|
|Firebox Area||195 sq. ft||195 sq. ft||166 sq. ft||166 sq. ft||166 sq. ft|
|Grate Area||31.60 sq. ft||31.60 sq. ft||28.20 sq. ft||28.20 sq. ft||28.20 sq. ft|
|Evaporative Heating Surface||2226 sq. ft||2897 sq. ft||2333 sq. ft||2333 sq. ft||1786 sq. ft|
|Superheating Surface||429 sq. ft||367 sq. ft|
|Combined Heating Surface||2655 sq. ft||2897 sq. ft||2333 sq. ft||2333 sq. ft||2153 sq. ft|
|Evaporative Heating Surface/Cylinder Volume||165.32||258.09||273.44||273.44||209.33|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||6320||6952||5076||5640||5640|
|Same as above plus superheater percentage||7331||6952||5076||5640||6599|
|Same as above but substitute firebox area for grate area||45240||42900||29880||33200||38844|