Bangor & Aroostook 4-6-0 "Ten-wheeler" Locomotives of the USA


Class Details by Steve Llanso of Sweat House Media

Class C-1 (Locobase 5997)

Data out of BAR locomotive diagram book provided in April 2004 from Allen Stanley's extensive Raildata collection.

These passenger locomotives befitted the BAR's relatively modest service. Note that the relatively undemanding boiler pressure led to a high Factor of Adhesion; they probably didn't slip much.

Some lasted to the end of steam. These were superheated; the results are found in Locobase


Class C-1 (Locobase 6614)

Data out of 1938 BAR locomotive diagram book provided in April 2005 from Allen Stanley's extension collection.

Although the BAR waited until relatively late in the game to superheat two of the four C-1 Ten-wheelers, they went further than many other railroads when they did so. New superheated boilers manufactured by Alco from a modified design were accompanied by new fireboxes; heating surface area was down, but the superheater more than made up for the reduction as did the higher boiler pressure rating.


Class D-1 (Locobase 5998)

Data out of BAR 7 locomotive diagram book provided in May 2005 by Allen Stanley from his extensive Raildata collection.

This numerous class of Ten Wheelers set the tone on the BAR for passenger locomotives. Manchester delivered the first 10 (works #M1783-92, numbered 60-64 and 50-54). In the next year, Manchester was absorbed by Alco and the next group -- 55-59 -- had Alco numbers (#26022-26). A 3-year pause and the last 13 were delivered in several batches. 31137-40, 37518-9, 41434, 38813-17, and 41433 (in engine number order).

Comprising the majority of 4-6-0s on the BAR, this class was retired over a couple of decades. The first left in 1927, the last at the very end of steam in 1952.


Class D-2 (Locobase 5999)

Data from BAR locomotive diagram book provided in April 2004 from Allen Stanley's extensive Raildata collection. Work numbers were 43362-43367 in Spetember 1907.

Not clear why this class has a different class ID than the one described in Locobase 5998. About the only difference evident in the diagram book was the tender. In any case, the quintet had a similar career.


Class D-3 - superheated (Locobase 6000)

Data out of BAR locomotive diagram book provided in April 2004 from Allen Stanley's extension collection.

The last 4-6-0s to be built for the BAR, this quintet had seven fewer tubes than the D-1s and D-2s and higher boiler pressure. A commensurate increase in weight kept the factor of adhesion about the same.

The data in the specs reflects the 1917-1918 superheating.


Class Ea - superheated (Locobase 9248)

Data out of BAR 7 - 1951 locomotive diagram book supplied in May 2005 by Allen Stanley from his extensive Raildata collection.

This class was originally supplied by Alco's Rhode Island works in 1906. In the superheating phase, the BAR dropped the boiler pressure once it reconfigured the boiler to accept a Schmidt smoketube superheater.


Class F (Locobase 6005)

Data out of BAR locomotive diagram book provided in April 2004 from Allen Stanley's extension collection. The builders' data comes from a table compiled by B. Rumary based on information from Jeremy Lambert and supplied by Allen Stanley in March 2004. Rumary-Lambert assign works #1629-1630 (February-March 1895) and 1635-1636 (May 1895).

Among the oldest unmodified locomotives when the Diagram Book was published in the mid-1920s, these TenWheelers were recorded as having been scrapped. (233 in July 1923, 232 in July 1924, 231 in August 1925 -- 230 lasted until July 1933.)


Class F-1 (Locobase 6004)

Data out of BAR locomotive diagram book provided in April 2004 from Allen Stanley's extension collection.

This duo seem not have been superheated as were the other TenWheelers still in service when this Diagram Book was prepared.

Specifications by Steve Llanso of Sweat House Media
ClassC-1C-1D-1D-2D-3 - superheated
Locobase ID5997 6614 5998 5999 6000
RailroadBangor & AroostookBangor & AroostookBangor & AroostookBangor & AroostookBangor & Aroostook
CountryUSAUSAUSAUSAUSA
Whyte4-6-04-6-04-6-04-6-04-6-0
Number in Class422866
Road Numbers240-243242-24350-7782-8790-95
GaugeStdStdStdStdStd
Number Built42866
BuilderManchesterShopsManchesterAlco-ManchesterManchester
Year19021935190119071911
Valve GearStephensonBakerStephensonStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase (ft)18.4218.4218.4218.4218.42
Engine Wheelbase (ft)24.4224.4224.4224.4224.42
Ratio of driving wheelbase to overall engine wheebase 0.75 0.75 0.75 0.75 0.75
Overall Wheelbase (engine & tender) (ft)49.5849.5849.5849.5852.10
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)113,000125,700111,875112,000122,760
Engine Weight (lbs)146,000162,600144,500144,500164,600
Tender Loaded Weight (lbs)90,00011,00090,000106,000101,370
Total Engine and Tender Weight (lbs)236,000173,600234,500250,500265,970
Tender Water Capacity (gals)40004000400050005000
Tender Fuel Capacity (oil/coal) (gals/tons)77798
Minimum weight of rail (calculated) (lb/yd)6370626268
Geometry Relating to Tractive Effort
Driver Diameter (in)6969636363
Boiler Pressure (psi)190200180180200
High Pressure Cylinders (dia x stroke) (in)19" x 26"19.5" x 26"20" x 26"20" x 26"20" x 26"
Tractive Effort (lbs)21,96924,35825,25725,25728,063
Factor of Adhesion (Weight on Drivers/Tractive Effort) 5.14 5.16 4.43 4.43 4.37
Heating Ability
Firebox Area (sq ft)216180166166166
Grate Area (sq ft)27.4027.9027.2527.2527.25
Evaporative Heating Surface (sq ft)21361643213621361783
Superheating Surface (sq ft)369388
Combined Heating Surface (sq ft)21362012213621362171
Evaporative Heating Surface/Cylinder Volume250.35182.82225.94225.94188.60
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation52065580490549055450
Same as above plus superheater percentage52066584490549056431
Same as above but substitute firebox area for grate area41,04042,48029,88029,88039,176
Power L1823615,0075930593013,561
Power MT482.05789.61350.57350.18730.62

Specifications by Steve Llanso of Sweat House Media
ClassEa - superheatedFF-1
Locobase ID9248 6005 6004
RailroadBangor & AroostookBangor & AroostookBangor & Aroostook
CountryUSAUSAUSA
Whyte4-6-04-6-04-6-0
Number in Class342
Road Numbers140-14223-26 / 230-233234-235
GaugeStdStdStd
Number Built42
BuilderB&AManchesterManchester
Year191718951907
Valve GearBakerStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase (ft)14.831513.83
Engine Wheelbase (ft)25.8325.5823.83
Ratio of driving wheelbase to overall engine wheebase 0.57 0.59 0.58
Overall Wheelbase (engine & tender) (ft)58.7947.7549.58
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)138,70090,00092,000
Engine Weight (lbs)184,300120,000120,000
Tender Loaded Weight (lbs)145,00076,900106,000
Total Engine and Tender Weight (lbs)329,300196,900226,000
Tender Water Capacity (gals)750039005000
Tender Fuel Capacity (oil/coal) (gals/tons)1259
Minimum weight of rail (calculated) (lb/yd)775051
Geometry Relating to Tractive Effort
Driver Diameter (in)636769
Boiler Pressure (psi)175155190
High Pressure Cylinders (dia x stroke) (in)22.5" x 26"18" x 24"18" x 24"
Tractive Effort (lbs)31,07815,29118,200
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.46 5.89 5.05
Heating Ability
Firebox Area (sq ft)178150
Grate Area (sq ft)44.5418.9027.25
Evaporative Heating Surface (sq ft)232217901695
Superheating Surface (sq ft)465
Combined Heating Surface (sq ft)278717901695
Evaporative Heating Surface/Cylinder Volume194.07253.23239.79
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation779529305178
Same as above plus superheater percentage912029305178
Same as above but substitute firebox area for grate area36,44628,500
Power L111,3607558
Power MT541.70543.34


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