Madras & Southern Mahratta 2-8-0 Locomotives in India


Class Details by Steve Llanso of Sweat House Media

Class 477 (Locobase 20163)

Data from "Consolidation Superheater Locomotive, Madras & Southern Mahratta", Locomotive Magazine, Volume XIX [19] (15 February 1913), pp. 30-31.

The LM report said that this class was based on the standard engines of the Indian Standards Committee, but included a superheater and a reduced boiler pressure setting. The Belpaire firebox was standard as were the piston valves, but the percentage of heating surface area supplied by the superheater was higher than in most British-built locomotives.

Similar locomotives supplied by Kitson went to the M&SM in 1919; see Locobase 20164.


Class 481 (Locobase 20164)

Data from "Consolidation Locomotives, Madras & Southern Mahratta", Locomotive Magazine, Volume XX [25], No. 324 (15 August 1919), pp. 30-31. See also "Recent Locomotivdes by Messrs. Arrmstrong, Whitworth & Co., Ltc, Locomotive News and Railway Contractor, Volume XI [11], No 5 (10 March 1922), pp. 146-149.Kitson & Company supplied two in 1919 and Armstrong-Whitworth followed with 17 in 1921. The latter represented A-W works numbers 94-110.

Although Kitson built these Consolidations "to the designs and specifications of Messrs. Rendel, Plamer & Tritton, Consulting Engineers", they followed most of the guidelines of the Indian Railway Board and the Engineering Standards Committee. They used exactly the same Belpaire firebox and grate as the Stephenson-built 2-8-0s of 1910 (Locobase 20163), but opted for fewer tubes, flues, and elements than had the earlier locomotives.

The A-W engines were described in 1922 as virtual duplicates of the Bombay, Baroda & Central India 133 class (Locobase 20884).

Principal Dimensions by Steve Llanso of Middle Run Media
Class477481
Locobase ID20163 20164
RailroadMadras & Southern MahrattaMadras & Southern Mahratta
CountryIndiaIndia
Whyte2-8-02-8-0
Number in Class21
Road Numbers481-499
Gauge5'6"5'6"
Number Built21
BuilderRobert Stephenson & Coseveral
Year19101919
Valve GearWalschaertWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)16 / 4.8816 / 4.88
Engine Wheelbase (ft / m)25 / 7.6225 / 7.62
Ratio of driving wheelbase to overall engine wheelbase 0.64 0.64
Overall Wheelbase (engine & tender) (ft / m)50.73 / 15.46
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)144,032 / 65,332143,920 / 65,281
Engine Weight (lbs / kg)164,416 / 74,578163,856 / 74,324
Tender Loaded Weight (lbs / kg)142,980 / 64,855103,040 / 46,738
Total Engine and Tender Weight (lbs / kg)307,396 / 139,433266,896 / 121,062
Tender Water Capacity (gals / ML)4800 / 18.184800 / 18.18
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 8.25 / 8 8.25 / 8
Minimum weight of rail (calculated) (lb/yd / kg/m)60 / 3060 / 30
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)56.50 / 143556.50 / 1435
Boiler Pressure (psi / kPa)160 / 1100160 / 1100
High Pressure Cylinders (dia x stroke) (in / mm)22" x 26" / 559x66022" x 26" / 559x660
Tractive Effort (lbs / kg)30,291 / 13739.7830,291 / 13739.78
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.75 4.75
Heating Ability
Tubes (number - dia) (in / mm)
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)
Firebox Area (sq ft / m2)167 / 15.51168 / 15.61
Grate Area (sq ft / m2)32 / 2.9732 / 2.97
Evaporative Heating Surface (sq ft / m2)1621 / 150.601579 / 146.69
Superheating Surface (sq ft / m2)375 / 34.84260 / 24.15
Combined Heating Surface (sq ft / m2)1996 / 185.441839 / 170.84
Evaporative Heating Surface/Cylinder Volume141.71138.03
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation51205120
Same as above plus superheater percentage60935837
Same as above but substitute firebox area for grate area31,79730,643
Power L176806268
Power MT470.21384.06

All material Copyright © SteamLocomotive.com
Wes Barris