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 Wheelbase18.42'18.42'18.42'18.42'18.42'
Engine Wheelbase24.42'24.42'24.42'24.42'24.42'
Ratio of driving wheelbase to overall engine wheebase 0.75 0.75 0.75 0.75 0.75
Overall Wheelbase (engine & tender)49.58'49.58'49.58'49.58'52.10'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers113000 lbs125700 lbs111875 lbs112000 lbs122760 lbs
Engine Weight146000 lbs162600 lbs144500 lbs144500 lbs164600 lbs
Tender Light Weight90000 lbs11000 lbs90000 lbs106000 lbs101370 lbs
Total Engine and Tender Weight236000 lbs173600 lbs234500 lbs250500 lbs265970 lbs
Tender Water Capacity4000 gals4000 gals4000 gals5000 gals5000 gals
Tender Fuel Capacity (oil/coal)7 tons7 tons7 tons9 tons8 tons
Minimum weight of rail (calculated)63 lb/yard70 lb/yard62 lb/yard62 lb/yard68 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter69"69"63"63"63"
Boiler Pressure190 psi200 psi180 psi180 psi200 psi
Cylinders (dia x stroke)19" x 26"19.5" x 26"20" x 26"20" x 26"20" x 26"
Tractive Effort21969 lbs24358 lbs25257 lbs25257 lbs28063 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 5.14 5.16 4.43 4.43 4.37
Heating Ability
Firebox Area216 sq. ft180 sq. ft166 sq. ft166 sq. ft166 sq. ft
Grate Area27.40 sq. ft27.90 sq. ft27.25 sq. ft27.25 sq. ft27.25 sq. ft
Evaporative Heating Surface2136 sq. ft1643 sq. ft2136 sq. ft2136 sq. ft1783 sq. ft
Superheating Surface369 sq. ft388 sq. ft
Combined Heating Surface2136 sq. ft2012 sq. ft2136 sq. ft2136 sq. ft2171 sq. ft
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 area4104042480298802988039176
Power L18236150075930593013561
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 Wheelbase14.83'15'13.83'
Engine Wheelbase25.83'25.58'23.83'
Ratio of driving wheelbase to overall engine wheebase 0.57 0.59 0.58
Overall Wheelbase (engine & tender)58.79'47.75'49.58'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers138700 lbs90000 lbs92000 lbs
Engine Weight184300 lbs120000 lbs120000 lbs
Tender Light Weight145000 lbs76900 lbs106000 lbs
Total Engine and Tender Weight329300 lbs196900 lbs226000 lbs
Tender Water Capacity7500 gals3900 gals5000 gals
Tender Fuel Capacity (oil/coal)12 tons5 tons9 tons
Minimum weight of rail (calculated)77 lb/yard50 lb/yard51 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter63"67"69"
Boiler Pressure175 psi155 psi190 psi
Cylinders (dia x stroke)22.5" x 26"18" x 24"18" x 24"
Tractive Effort31078 lbs15291 lbs18200 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.46 5.89 5.05
Heating Ability
Firebox Area178 sq. ft150 sq. ft
Grate Area44.54 sq. ft18.90 sq. ft27.25 sq. ft
Evaporative Heating Surface2322 sq. ft1790 sq. ft1695 sq. ft
Superheating Surface465 sq. ft
Combined Heating Surface2787 sq. ft1790 sq. ft1695 sq. ft
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 area36446028500
Power L11136007558
Power MT541.700543.34


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