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


Class Details by Steve Llanso of Sweat House Media

Class F-1/H-2 (Locobase 8391)

Data from AA Loco Diagrams (circa 1923) supplied in August 2022 and AA-M&LS 1 - 1928 locomotive diagram book dated supplied in May 2005, both 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 control when that railroad absorbed the Ann Arbor in 1925. but retained their "Ann Arbor" ID on their tenders.

131 was scrapped in October 1941 and 130 followed exactly three years later in October 1944..


Class F-2/H-3 (Locobase 7343)

Data from ; AA Loco Diagrams (circa 1923) supplied in August 2022 and AA-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 F-3/F4/H-4 (Locobase 8392)

Data from both AA Loco Diagrams (circa 1923) supplied in August 2022 and 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).


Class F/F-1/H-1 (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 Loco Diagrams (circa 1923) supplied in August 2022 and AA-M&LS 1 - 1928 locomotive diagram book dated supplied in May 2005-both by Allen Stanley from his extensive Rail Data Exchange collection. (Thanks to Chris Hohl for his 4 April 2023 email reporting the correct original and later tender water capacities, the original loaded tender weight, the original diameter, and the correct number sequence applied by the AA later on.) Works numbers 16405-16406 in December 1898.

The Ann Arbor's two class F Ten-wheelers were delivered with the boilers and fireboxes shown in this entry. Tenders trailing behind the pair held a maximum of 4,000 US gallons (15, 140 litres) of water; each weighed 90,000 lb (40,863 kg) loaded

In 1909, the Ann Arbor renumbered the pair as 100-101.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 (167.32 sq m) of heating surface. 101's boiler had 236 tubes and a total heating surface of 1,941 sq ft (180.32 sq m). Both had 14 sq ft (1.30 sq m) of arch tubes contributing to the firebox heating surface.

The railroad held on their Ten-wheelers for decades. After the Wabash's 1925 gain of control and its 97% ownership share in 1930, the two were placed in their own class H -1 and renumbered 120-121. But the engines retained their "Ann Arbor"ID on their tenders.

120 was retired at some point and converted into a stationary boiler. 121 went to the ferro-knacker in April 1951.

Principal Dimensions by Steve Llanso of Sweat House Media

ClassF-1/H-2F-2/H-3F-3/F4/H-4F/F-1/H-1
Locobase ID8391 7343 8392 8390
RailroadAnn Arbor (AA)Ann Arbor (AA)Ann Arbor (AA)Ann Arbor (AA)
CountryUSAUSAUSAUSA
Whyte4-6-04-6-04-6-04-6-0
Number in Class1272
Road Numbers43-44/102-103/130-13145-46/104-105/140-14146-52 /106-111/150-15441-42/100-101/120-121
GaugeStdStdStdStd
Number Built1272
BuilderBurnham, Williams & CoPittsburghBurnham, Williams & CoBurnham, Williams & Co
Year1898190019021898
Valve GearStephensonStephensonStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)13 / 3.9613.50 / 4.1113.50 / 4.1113.50 / 4.11
Engine Wheelbase (ft / m)23.17 / 7.0624 / 7.3224.35 / 7.4224.50 / 7.47
Ratio of driving wheelbase to overall engine wheelbase 0.56 0.56 0.55 0.55
Overall Wheelbase (engine & tender) (ft / m)55.73 / 16.9957.93 / 17.6652.42 / 15.98
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)104,665 / 47,475114,000 / 51,710104,000 / 47,17490,000 / 40,823
Engine Weight (lbs / kg)131,240 / 59,530140,000 / 63,503150,000 / 68,039125,000 / 56,699
Tender Loaded Weight (lbs / kg)105,800 / 47,990136,500 / 61,915171,100 / 77,610105,800 / 47,990
Total Engine and Tender Weight (lbs / kg)237,040 / 107,520276,500 / 125,418321,100 / 145,649230,800 / 104,689
Tender Water Capacity (gals / ML)7900 / 29.927300 / 27.655600 / 21.217300 / 27.65
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)10 / 910 / 910 / 910 / 9
Minimum weight of rail (calculated) (lb/yd / kg/m)58 / 2963 / 31.5058 / 2950 / 25
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)62 / 157563 / 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)23,162 / 10506.1222,795 / 10339.6523,162 / 10506.1223,162 / 10506.12
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.52 5.00 4.49 3.89
Heating Ability
Tubes (number - dia) (in / mm)275 - 2" / 51248 - 2" / 51275 - 2" / 51230 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)12.83 / 3.9114.50 / 4.4214.42 / 4.4014.50 / 4.42
Firebox Area (sq ft / m2)152 / 14.12138 / 12.82159 / 14.77164.50 / 15.28
Grate Area (sq ft / m2)31 / 2.8828 / 2.6031.70 / 2.9528.20 / 2.62
Evaporative Heating Surface (sq ft / m2)1988 / 184.692009 / 186.642223 / 206.522041 / 189.61
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1988 / 184.692009 / 186.642223 / 206.522041 / 189.61
Evaporative Heating Surface/Cylinder Volume233.06235.52260.61239.27
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation5580504057065076
Same as above plus superheater percentage5580504057065076
Same as above but substitute firebox area for grate area27,36024,84028,62029,610
Power L15992598065816244
Power MT378.64346.94418.52458.85

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