Caledonian 2-2-2 Locomotives in Great_Britain


Class Details by Steve Llanso of Sweat House Media

Class 10 (Locobase 13526)

Data from H B Barlow, "The Passenger Engines on the Caledonian Railway," Division A - Locomotive Engines - 7th Paper in Thomas Tredgold (ed), The principles and practice and explanation of the machinery of locomotive engines in operation on the several lines of railway, Volume 1 (London: John Weale, 1850). See also "Early Passenger Locomotive, Caledonian Railway", The Locomotive, Volume 16 (15 November 1910), p. 254. Works numbers were 299-308 in 1847.

The Locomotive reports observes that this design was modelled after several Alexander Allan designs. "In fact," the report adds,"the engines of this class here illustrated were built from drawings supplied by Mr Allan."


Class unknown (Locobase 2205)

Data from Ahrons (1927).

According to Ahrons, these engines, designed by Benjamin Connor, had mixed frames (wood and iron) and outside cylinders.

Glover (1967) notes that the 98" drivers may have been the tallest ever used in a British engine. (It's hard to imagine taller drivers anywhere.) He adds:"They are reported to have operated very satisfactorily, though how such diminuitive machines could have coped successfully with Beattock and other formidable gradients ...remains a mystery." Indeed, Daniel Kinnear Clark, writing in 1862 (p.14), reported "...they frequently take, without assistance, 14 loaded carriages up the Beattock incline, 10 miles [16 km] long, at the rate of 30 miles per hour. The gradient is 1 in 84 (1.2%) for four miles, and 1 in 75 (1.33%) for six miles."

Principal Dimensions by Steve Llanso of Sweat House Media

Class10unknown
Locobase ID13526 2205
RailroadCaledonianCaledonian
CountryGreat BritainGreat Britain
Whyte2-2-22-2-2
Number in Class1016
Road Numbers10-19
GaugeStdStd
Number Built1016
BuilderTayleurRollox
Year18471859
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)
Engine Wheelbase (ft / m)15.08 / 4.6015.66 / 4.77
Ratio of driving wheelbase to overall engine wheelbase
Overall Wheelbase (engine & tender) (ft / m)27.44 / 8.36
Axle Loading (Maximum Weight per Axle) (lbs / kg)20,160 / 914432,592 / 14,784
Weight on Drivers (lbs / kg)32,592 / 14,784
Engine Weight (lbs / kg)47,040 / 21,33768,432 / 31,040
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)
Tender Water Capacity (gals / ML)960 / 3.64
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)54 / 27
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)72 / 182998 / 2489
Boiler Pressure (psi / kPa)100 / 6.90120 / 8.30
High Pressure Cylinders (dia x stroke) (in / mm)15" x 20" / 381x50817.25" x 24" / 438x610
Tractive Effort (lbs / kg)5313 / 2409.947433 / 3371.56
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.38
Heating Ability
Tubes (number - dia) (in / mm)158 - 1.75" / 44192 - 1.875" / 48
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)10.12 / 3.0811.50 / 3.51
Firebox Area (sq ft / m2)96 / 8.92
Grate Area (sq ft / m2)10.50 / 0.9813.90 / 1.29
Evaporative Heating Surface (sq ft / m2)1190 / 110.59
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1190 / 110.59
Evaporative Heating Surface/Cylinder Volume183.31
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation10501668
Same as above plus superheater percentage10501668
Same as above but substitute firebox area for grate area11,520
Power L15042
Power MT341.06

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