Ann Arbor 4-6-0 "Ten-Wheeler" Locomotives in the USA


Class Details by Steve Llanso of Sweat House Media

Class F (Locobase 8390)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 22, p. 19. AA-M&LS 1 - 1928 locomotive diagram book dated supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. Works numbers 16405-16406 in December 1898.

The Ann Arbor's two F1 Ten-wheeler were delivered with the boilers and fireboxes shown in this entry. Over time, each of the pair showed up in diagrams with different numbers of tubes and longer, narrower grates with less area; this probably resulted from rebuilds in the 1920s. In 1928, 100 had the smaller amount - 218 tubes for a total of 1,801 sq ft of heating surface. 101's boiler had 236 tubes and a total heating surface of 1,941 sq ft. Both had 14 sq ft of arch tubes contributing to the firebox heating surface.

The railroad held on their Ten-wheelers for decades. Ex-100 was scrapped in April 1951.


Class F2 (Locobase 7343)

Data fromAA-M&LS 1 - 1928 locomotive diagram book dated supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. Works numbers 2162-2163 in October 1900.

This pair of Ten-wheelers achieved an unusual distinction for the Ann Arbor - both engines had the same number of tubes and, as a result, the same heating surface. Never superheated, 103 (by that time renumbered 140) was scrapped in November 1928.


Class F2 (Locobase 8391)

Data from AA-M&LS 1 - 1928 locomotive diagram book dated supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. See also DeGolyer, Volume 21, p. 215. Works number were 16025-16026 in July 1898.

Locobase 8390 shows smaller F1s from Baldwin in 1899. The present pair of Ten-wheelers delivered in 1899 were intended for the New York & Ottawa, but wound up on the Ann Arbor instead.

Later renumbered 130-131, the F2s ran out their last years under Wabash colors when that railroad absorbed the Ann Arbor in 1925. They were scrapped in March 1933 and August 1940, respectively.


Class F4 (Locobase 8392)

Data from AA-M&LS 1 - 1928 locomotive diagram book dated supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. See also DeGolyer, Volume 24, p. 165. Works numbers were 199880-19989 in January 1902; 21526, 21570 in January 1903; 23202, 23212 in November.

Continuing the line of small Ten-wheelers supplied to the Ann Arbor by Baldwin beginning in 1899, this batch came in 1902-1903 with the tube count shown.

Over the next couple of decades, the six that remained on the roster had five different tube counts. By 1928, following count and evaporative surface area:

Engine # Tubes EHS Renumbered Scrapped

106 235 1,932 November 1928

107 230 1,895 150

108 235 1,932 151 March 1951

109 268 2,180 152 March 1933

110 264 2,165 153 December 1948

111 233 1,932 154 February 1933

110 & 111 had 15 sq ft (1.39 sq m) from two arch tubes that increase firebox heating surface to 185 sq ft (17.19 sq m). Tender water capacity rose to 7,300 US gallons (27,631 litres), which boosted loaded weight to 121,100 lb (54,930 kg).

Principal Dimensions by Steve Llanso of Sweat House Media
ClassFF2F2F4
Locobase ID8390 7343 8391 8392
RailroadAnn Arbor (AA)Ann Arbor (AA)Ann Arbor (AA)Ann Arbor (AA)
CountryUSAUSAUSAUSA
Whyte4-6-04-6-04-6-04-6-0
Number in Class2217
Road Numbers41-42/101-10245-46/104-105/140-14143-44/102-103/130-13147-52 /106-111/150-154
GaugeStdStdStdStd
Number Built2217
BuilderBurnham, Williams & CoPittsburghBurnham, Williams & CoBurnham, Williams & Co
Year1899190018981902
Valve GearStephensonStephensonStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)13.50 / 4.1113.50 / 4.1113 / 3.9613.50 / 4.11
Engine Wheelbase (ft / m)24.33 / 7.4224 / 7.3223.17 / 7.0624.35 / 7.42
Ratio of driving wheelbase to overall engine wheebase 0.55 0.56 0.56 0.55
Overall Wheelbase (engine & tender) (ft / m)56.85 / 17.3355.73 / 16.99
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)90,000 / 40,823114,000 / 51,710104,665 / 47,475104,000 / 47,174
Engine Weight (lbs / kg)125,000 / 56,699140,000 / 63,503131,240 / 59,530154,000 / 69,853
Tender Loaded Weight (lbs / kg)105,800 / 47,990136,500 / 61,915105,800 / 47,990
Total Engine and Tender Weight (lbs / kg)230,800 / 104,689276,500 / 125,418237,040 / 107,520
Tender Water Capacity (gals / ML)7900 / 29.927300 / 27.657900 / 29.925600 / 21.21
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)10 / 9.1010 / 9.1010 / 9.1010 / 9.10
Minimum weight of rail (calculated) (lb/yd / kg/m)50 / 2563 / 31.5058 / 2958 / 29
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)63 / 160063 / 160062 / 157562 / 1575
Boiler Pressure (psi / kPa)180 / 12.40180 / 12.40180 / 12.40180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)19" x 26" / 483x66019" x 26" / 483x66019" x 26" / 483x66019" x 26" / 483x660
Tractive Effort (lbs / kg)22,795 / 10339.6522,795 / 10339.6523,162 / 10506.1223,162 / 10506.12
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.95 5.00 4.52 4.49
Heating Ability
Firebox Area (sq ft / m2)164.50 / 15.29138 / 12.83152 / 14.12159 / 14.78
Grate Area (sq ft / m2)28.20 / 2.6228 / 2.6031 / 2.8831.70 / 2.95
Evaporative Heating Surface (sq ft / m2)2041 / 189.682009 / 186.711988 / 184.692223 / 206.60
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)2041 / 189.682009 / 186.711988 / 184.692223 / 206.60
Evaporative Heating Surface/Cylinder Volume239.21235.46233.00260.55
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation5076504055805706
Same as above plus superheater percentage5076504055805706
Same as above but substitute firebox area for grate area29,61024,84027,36028,620
Power L16343597959916579
Power MT466.13346.88378.58418.39

Reference