Bombay, Baroda & Central India 4-6-2 Locomotives in India


Class Details by Steve Llanso of Sweat House Media

Class P (Locobase 20478)

Data from "Pacific Type Express Locomotives, Bombay, Baroda & Central India", Locomotive Magazine, Volume 30, No 380 (15 April 1924); and "New Express and Freight Locomotives, Bombay, Baroda & Central India", Railway Engineer, Volume 45, No 5 (May 1924), 168-179, 178.. Works numbers were 5366-5367 in 1924.

Among the biggest Indian express locomotives of the time, this pair was designed by the BB&IC's London-based consulting engineers Rendel, Palmer & Britton. They were about the same size as the IRS XC type and had the same cylinder volume. But the firebox was a bit smaller. Even so, that furnace designed to be large enough to burn India's low-grade coal economically.

Kitson turned out four big engines for the BB&CI, a pair of Mikados (Locobase 20998) and this pair of Pacifics. RE's report noted that a key goal was the "duplication of as many parts as possible" which the consultng engineers and the builder carried out "effectively" in "the boiler and its fittings, grate bars and ashpan, cab, cylinders valve motion, pistons and rods, crossheads and connecting rods, coupled wheel axlebox and hornblocks, springs and gear, and the trailing radial truck."

In addition to the large grate, the firebox featured a combustion chamber and 24 sq ft (2.23 sq m) of arch tubes. Steam was admitted to the cylinders through relatively large 11" (279 mm) piston valves. The trailing truck was a radial design with Cartazzi axleboxes linked through compensating beams with the trailing coupled axle's springs.

In addition to the large grate, the firebox featured a combustion chamber and 24 sq ft (2.23 sq m) of arch tubes. Steam was admitted to the cylinders through relatively large 11" (279 mm) piston valves. The trailing truck was a radial design with Cartazzi axleboxes linked through compensating beams with the trailing coupled axle's springs." The tenders were also identical save the coal capacity, which amounted to 1 1/2 more long tons.

Principal Dimensions by Steve Llanso of Sweat House Media

ClassP
Locobase ID20478
RailroadBombay, Baroda & Central India
CountryIndia
Whyte4-6-2
Number in Class2
Road Numbers601-602
Gauge5'6"
Number Built2
BuilderKitson & Co
Year1924
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)12.75 / 3.89
Engine Wheelbase (ft / m)34.65 / 10.56
Ratio of driving wheelbase to overall engine wheelbase 0.37
Overall Wheelbase (engine & tender) (ft / m)66.29 / 20.21
Axle Loading (Maximum Weight per Axle) (lbs / kg)44,240
Weight on Drivers (lbs / kg)132,270 / 59,997
Engine Weight (lbs / kg)211,008 / 95,712
Tender Loaded Weight (lbs / kg)164,752 / 74,730
Total Engine and Tender Weight (lbs / kg)375,760 / 170,442
Tender Water Capacity (gals / ML)7488 / 28.36
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)15.70 / 14.30
Minimum weight of rail (calculated) (lb/yd / kg/m)73 / 36.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)74 / 1880
Boiler Pressure (psi / kPa)160 / 11
High Pressure Cylinders (dia x stroke) (in / mm)23" x 28" / 584x711
Tractive Effort (lbs / kg)27,222 / 12347.71
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.86
Heating Ability
Tubes (number - dia) (in / mm)
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)18 / 5.49
Firebox Area (sq ft / m2)239 / 22.20
Grate Area (sq ft / m2)48 / 4.46
Evaporative Heating Surface (sq ft / m2)2359 / 219.16
Superheating Surface (sq ft / m2)550 / 51.10
Combined Heating Surface (sq ft / m2)2909 / 270.26
Evaporative Heating Surface/Cylinder Volume175.20
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation7680
Same as above plus superheater percentage9139
Same as above but substitute firebox area for grate area45,506
Power L112,463
Power MT623.18

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