East African Railways 4-8-4 Locomotives in Kenya


Class Details by Steve Llanso of Sweat House Media

Class 13 (Locobase 4332)

Data from Dr. Jonathan Smith's data tables at [link] ... .Works numbers were 27060-27077 in 1952.

Ziel and Eagleson (1973) show this to have been a large switcher and that there were at least 15 in the class. It had long tanks on each side extending from the pilot to the cab.

[link] (November 2002), the Nairobi Railway Museum website, tells us that these 4-8-4Ts were converted from 4-8-2Ts using trailing bogies from scrapped Class 50 Garratts. The conversion was a success, says the museum, noting "[The conversion] improved the weight distribution and cured them of their habit of derailing in sidings."

Principal Dimensions by Steve Llanso of Middle Run Media
Class13
Locobase ID4332
RailroadEast African Railways
CountryKenya
Whyte4-8-4T
Number in Class18
Road Numbers
GaugeMetre
Number Built18
Builder
Year1952
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)
Engine Wheelbase (ft / m)
Ratio of driving wheelbase to overall engine wheelbase
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)116,480 / 52,835
Engine Weight (lbs / kg)194,880 / 88,396
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)194,880 / 88,396
Tender Water Capacity (gals / ML)3522 / 13.34
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)966 / 3656
Minimum weight of rail (calculated) (lb/yd / kg/m)49 / 24.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)45.50 / 1156
Boiler Pressure (psi / kPa)180 / 1240
High Pressure Cylinders (dia x stroke) (in / mm)18" x 24" / 457x610
Tractive Effort (lbs / kg)26,148 / 11860.55
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.45
Heating Ability
Tubes (number - dia) (in / mm)
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)
Firebox Area (sq ft / m2)
Grate Area (sq ft / m2)25 / 2.32
Evaporative Heating Surface (sq ft / m2)985 / 91.54
Superheating Surface (sq ft / m2)220 / 20.45
Combined Heating Surface (sq ft / m2)1205 / 111.99
Evaporative Heating Surface/Cylinder Volume139.35
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation4500
Same as above plus superheater percentage5310
Same as above but substitute firebox area for grate area
Power L1
Power MT

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