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 RG report laid particular emphasis on the boiler's combustion chamber, which the builder claimed offered several advantages for "wide firebox engines burning soft coal." Adding a chamber to the front of the firebox "removes the tubes from the hottest part of the fire, thereby decreasing tube leakage; adds to the heating surface of the firebox, and gives a largely increased firebox volume, which tends toward better combustion."
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.
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.
|Principal Dimensions by Steve Llanso of Sweat House Media|
|Class||Y||Y - superheated|
|Railroad||Buffalo, Rochester, & Pittsburgh (B&O)||Buffalo, Rochester, & Pittsburgh (B&O)|
|Number in Class||8||8|
|Builder||Alco-Brooks||BR & P|
|Locomotive Length and Weight|
|Driver Wheelbase (ft / m)||19 / 5.79||19 / 5.79|
|Engine Wheelbase (ft / m)||28.33 / 8.63||28.33 / 8.63|
|Ratio of driving wheelbase to overall engine wheebase||0.67||0.67|
|Overall Wheelbase (engine & tender) (ft / m)||65.29 / 19.90||65.29 / 19.90|
|Axle Loading (Maximum Weight per Axle) (lbs / kg)|
|Weight on Drivers (lbs / kg)||243,000 / 110,223||250,000 / 113,398|
|Engine Weight (lbs / kg)||268,000 / 121,563||275,500 / 124,965|
|Tender Loaded Weight (lbs / kg)||162,000 / 73,482||164,000 / 74,389|
|Total Engine and Tender Weight (lbs / kg)||430,000 / 195,045||439,500 / 199,354|
|Tender Water Capacity (gals / ML)||9000 / 34.09||9000 / 34.09|
|Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)||14 / 12.70||14 / 12.70|
|Minimum weight of rail (calculated) (lb/yd / kg/m)||81 / 40.50||83 / 41.50|
|Geometry Relating to Tractive Effort|
|Driver Diameter (in / mm)||52 / 1321||52 / 1321|
|Boiler Pressure (psi / kPa)||200 / 13.80||200 / 13.80|
|High Pressure Cylinders (dia x stroke) (in / mm)||24" x 28" / 610x711||24" x 28" / 610x711|
|Tractive Effort (lbs / kg)||52,726 / 23916.14||52,726 / 23916.14|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||4.61||4.74|
|Firebox Area (sq ft / m2)||255.50 / 23.74||285.70 / 26.55|
|Grate Area (sq ft / m2)||55.50 / 5.16||55.50 / 5.16|
|Evaporative Heating Surface (sq ft / m2)||3536 / 328.50||2897 / 269.24|
|Superheating Surface (sq ft / m2)||582 / 54.09|
|Combined Heating Surface (sq ft / m2)||3536 / 328.50||3479 / 323.33|
|Evaporative Heating Surface/Cylinder Volume||241.19||197.60|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||11,100||11,100|
|Same as above plus superheater percentage||11,100||12,987|
|Same as above but substitute firebox area for grate area||51,100||66,854|