Bangor & Aroostook / Boston & Albany 2-8-0 "Consolidation" Locomotives of the USA


Class Details by Steve Llanso of Sweat House Media

Class G-2 (Locobase 408)

Data from 1938 BAR locomotive diagram book supplied in May 2005 by Allen Stanley from his extensive Raildata collection

Firebox heating surface included 21 sq ft of arch tubes. Locobase wonders about the superheater area because the boiler had the same number of flues (of the same length and diameter) as the 1921 Gs, also built by Alco (see Locobase 5994). But the area measures 76 sq ft less - Locobase still thinks the 1921 class's area was overstated.

Built in two batches in 1937 and 1945. Retired in 1951-1956.


Class G-34 (Locobase 15832)

Data from NYC&HR 9-1905 Locomotive Diagrams supplied in August 2013 by Allen Stanley from his extensive Raildata collection. Schenectady works numbers were 28952-28959 in November 1903 and 29347-29352 in December 1903.

Clearing the tall 63" drivers enough to allow for a 75" wide grate meant placing the firebox and boiler quite high above the wheels. Never superheated, this class of Consolidations was retired from the B&A in 1925-1928.


Class Ga/Gb - super heated (Locobase 5993)

Data from BAR 3 - 1923 locomotive diagram book provided in April 2004 by Allen Stanley from his extensive Raildata collection. Works numbers were 41522-41524 in March 1907 from the Rhode Island Works and 54944-54948 in October 1914 and 56742 in September 1916 from Schenectady.

12" (305 mm) piston valves. Two batches were built over seven years. The second group is credited in the diagram with one more tube (205) and apparently was superheated when delivered, but is otherwise identical except for the usual weight gain. (182,000 lb on the drivers, 210,000 total.)

The GAs were superheated in 1918, using boilers from the 193, 183, and 194. The whole class carried on until the end of steam.


Class Gc (Locobase 5994)

Data out of BAR 1- 1938 and BAR 7 - 1951 locomotive diagram books provided in April 2004 and May 2005 from Allen Stanley's extension collection. Works numbers were 62626-62631 in January 1921.

12" (305 mm) piston valves. This modest, but reasonably powerful 2-8-0 design was obviously satisfactory. In addition to the nine described in Locobase 5993, Schenectady supplied these six in 1921. The builder took the opportunity to go two better than the railroad in superheating the design, adding two flues and deleting ten tubes. The result was a relatively high superheat fraction of combined heating surface.

The given superheater area (which the diagram books insist upon) still seems much too high. Other installations with the same count and flue length (including the BAR's G-2s of 1937 - Locobase 408) show superheater areas of less than 600 square feet.


Class Go (Locobase 16034)

Data out of BAR 1- 1938 and BAR 7 - 1951 locomotive diagram books provided in April 2004 and May 2005 from Allen Stanley's extension collection. (Thanks to Chris Hohl for his April 2015 email pointing out the absence of this class and supplying a spreadsheet of specifications.) Works numbers were 65970, 65973 in November 1924.

These were duplicates of the class of Consolidations described in Locobase 5994. Like the other Consolidations on this Maine railroad, the pair saw steam out before retiring in 1947-1951.


Class Gp (Locobase 16035)

Data out of BAR 1- 1938 and BAR 7 - 1951 locomotive diagram books provided in April 2004 and May 2005 from Allen Stanley's extension collection. (Thanks to Chris Hohl for his April 2015 email pointing out the absence of this class and supplying a spreadsheet of specifications.) Works numbers were 65971-65972 in November 1924.

The BAR went back to Schenectady for four more Consolidations after buying the six described in Locobase 5994.Two repeated the specifications of the earilier engines; see Locobasse 16034.

The other two of the locomotives were modified in several ways. While cylinder volume dropped, boiler pressure went up considerably, resulting in a net gain in calculated tractive effort. Firebox width remained the same, but length increased by 9 1/2" (241 mm), which added about 4 sq ft to the grate area. .

Specifications by Steve Llanso of Sweat House Media
ClassG-2G-34Ga/Gb - super heatedGcGo
Locobase ID408 15832 5993 5994 16034
RailroadBangor & AroostookBoston & AlbanyBangor & AroostookBangor & AroostookBangor & Aroostook
CountryUSAUSAUSAUSAUSA
Whyte2-8-02-8-02-8-02-8-02-8-0
Number in Class612992
Road Numbers400-4052576-2589/976-989170-172, 180-185186-191192, 195
GaugeStdStdStdStdStd
Number Built61292
BuilderAlco-SchenectadyAlco-SchenectadyBARAlcoAlco-Schenectady
Year19371903191819211924
Valve GearBakerStephensonBakerBakerBaker
Locomotive Length and Weight
Driver Wheelbase16.75'17'16.75'16.75'16.75'
Engine Wheelbase26.50'25.75'25.25'25.25'25.25'
Ratio of driving wheelbase to overall engine wheebase 0.63 0.66 0.66 0.66 0.66
Overall Wheelbase (engine & tender)62.67'60.33'58.96'58.96'58.96'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers198400 lbs167000 lbs179500 lbs185000 lbs190000 lbs
Engine Weight238800 lbs190000 lbs204100 lbs212000 lbs215000 lbs
Tender Light Weight163300 lbs116000 lbs149000 lbs156000 lbs159000 lbs
Total Engine and Tender Weight402100 lbs306000 lbs353100 lbs368000 lbs374000 lbs
Tender Water Capacity8500 gals7500 gals7500 gals7500 gals7500 gals
Tender Fuel Capacity (oil/coal)12 tons12 tons12 tons12 tons12 tons
Minimum weight of rail (calculated)83 lb/yard70 lb/yard75 lb/yard77 lb/yard79 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter63"63"57"57"57"
Boiler Pressure225 psi200 psi175 psi175 psi190 psi
Cylinders (dia x stroke)22.25" x 30"21" x 30"23" x 30"23" x 30"23" x 30"
Tractive Effort45086 lbs35700 lbs41415 lbs41415 lbs44965 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.40 4.68 4.33 4.47 4.23
Heating Ability
Firebox Area212 sq. ft157 sq. ft216 sq. ft198 sq. ft198 sq. ft
Grate Area50.80 sq. ft50.32 sq. ft46.50 sq. ft46.70 sq. ft46.70 sq. ft
Evaporative Heating Surface2638 sq. ft3438 sq. ft2391 sq. ft2348 sq. ft2348 sq. ft
Superheating Surface584 sq. ft556 sq. ft660 sq. ft660 sq. ft
Combined Heating Surface3222 sq. ft3438 sq. ft2947 sq. ft3008 sq. ft3008 sq. ft
Evaporative Heating Surface/Cylinder Volume195.40285.87165.74162.76162.76
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1143010064813881738873
Same as above plus superheater percentage13487100649684997010825
Same as above but substitute firebox area for grate area5628631400449824227345896
Power L115669737497671069211609
Power MT696.46389.39479.83509.66538.81

Specifications by Steve Llanso of Sweat House Media
ClassGp
Locobase ID16035
RailroadBangor & Aroostook
CountryUSA
Whyte2-8-0
Number in Class4
Road Numbers193-194
GaugeStd
Number Built2
BuilderAlco-Schenectady
Year1924
Valve GearBaker
Locomotive Length and Weight
Driver Wheelbase16.75'
Engine Wheelbase24.92'
Ratio of driving wheelbase to overall engine wheebase 0.67
Overall Wheelbase (engine & tender)58.96'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers192000 lbs
Engine Weight222000 lbs
Tender Light Weight159000 lbs
Total Engine and Tender Weight381000 lbs
Tender Water Capacity8500 gals
Tender Fuel Capacity (oil/coal)12 tons
Minimum weight of rail (calculated)80 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter57"
Boiler Pressure225 psi
Cylinders (dia x stroke)21.25" x 30"
Tractive Effort45453 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.22
Heating Ability
Firebox Area216 sq. ft
Grate Area50.80 sq. ft
Evaporative Heating Surface2656 sq. ft
Superheating Surface528 sq. ft
Combined Heating Surface3184 sq. ft
Evaporative Heating Surface/Cylinder Volume215.68
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation11430
Same as above plus superheater percentage13373
Same as above but substitute firebox area for grate area56862
Power L114733
Power MT676.68

Photos


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