Buffalo, Rochester, & Pittsburgh 2-10-0 "Decapod" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class Y (Locobase 2067)

Data from "Decapod Locomotive for the Buffalo, Rochester & Pittsburgh," Railroad Gazette, Vol XLIII, No 6 (9 August 1907), pp. 151-152, and Alvin F Staufer & Lawrence W Sagle, B & O Power (1964). (Thanks to Chris Hohl for pointing out the valve gear ID and to Jim Ruth for his corrections concerning Clarion Hill.) Works numbers were 42720-42725 in June 1907 and 46408-46409 in August.

Equalization of the six axles involved two clusters: the pony truck equalized with the first two driving axles and the last three driving axles equalized separately.

The only BR&P Decapods, these had very small drivers for pusher service on a 17-mile (27.4 km) that ascended northbound at 68 feet/mile (33.4 m/km) or 1.3% between Clarion, Pa and Freeman. At the time the Ys were the heaviest locomotives Brooks had ever built and trailed tenders with the greatest water capacity then in service..

Jim Ruth emailed Locobase on 20 Jan 2014 with a well-informed update on just where and what "Clarion Hill" actually was on the BR&P:

"These locos were used on "Clarion Hill";but that's not actually between "Clarion" and

Freeman as stated. (The town of Clarion isn't anywhere near there or even on the BR&P.)

The location is known as "Clarion Junction";and is at Johnsonburg PA. There was a yard and helper station there at the base of the hill. (MAY have got the name as it's right

by the river, and the junction of the east and west branches of the Clarion River is in


To confuse matters more, there was another "Clarion Jct" near the town of Clarion..

The class was later superheated - see Locobase 9616. On the B&O they retained the Y class designation, but were renumbered 6500-6507.

Class Y - superheated (Locobase 9616)

Data from B & O to 1954 Asstd Loco Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection. (Thanks to Chris Hohl for pointing out the valve gear ID.)

Locobase isn't sure when the BR & P updated the Decks it had bought in 1907 (see Locobase 2067). The revision was confined primarily to the boiler, which surrendered the usual sheaf of fire tubes in favor of larger flues. The firebox heating surface included 30.2 sq ft (2.8 sq m) of arch tubes.

The result was a drier drag-freighter that served the BR & P and the B & O until 1950.

Specifications by Steve Llanso of Sweat House Media
ClassYY - superheated
Locobase ID2067 9616
RailroadBuffalo, Rochester, & Pittsburgh (B&O)Buffalo, Rochester, & Pittsburgh (B&O)
Number in Class88
Road Numbers501-5086500-6507
Number Built8
BuilderAlco-BrooksBR & P
Valve GearWalschaertWalschaert
Locomotive Length and Weight
Driver Wheelbase19'19'
Engine Wheelbase28.33'28.33'
Ratio of driving wheelbase to overall engine wheebase 0.67 0.67
Overall Wheelbase (engine & tender)65.29'65.29'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers243000 lbs250000 lbs
Engine Weight268000 lbs275500 lbs
Tender Light Weight162000 lbs164000 lbs
Total Engine and Tender Weight430000 lbs439500 lbs
Tender Water Capacity9000 gals9000 gals
Tender Fuel Capacity (oil/coal)14 tons14 tons
Minimum weight of rail (calculated)81 lb/yard83 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter52"52"
Boiler Pressure200 psi200 psi
Cylinders (dia x stroke)24" x 28"24" x 28"
Tractive Effort52726 lbs52726 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.61 4.74
Heating Ability
Firebox Area255.50 sq. ft285.70 sq. ft
Grate Area55.50 sq. ft55.50 sq. ft
Evaporative Heating Surface3536 sq. ft2897 sq. ft
Superheating Surface582 sq. ft
Combined Heating Surface3536 sq. ft3479 sq. ft
Evaporative Heating Surface/Cylinder Volume241.19197.60
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1110011100
Same as above plus superheater percentage1110012987
Same as above but substitute firebox area for grate area5110066854
Power L1569111307
Power MT258.16498.55


If you have any railroad data such as diagram books, rail station plans or anything else that you would be willing to share, please contact us.