North British 2-4-0 Locomotives in Great_Britain


Class Details by Steve Llanso of Sweat House Media

Class 233 (Locobase 10368)

Data from "Passenger Locomotives, Edinburgh & Glasgow Railway" The Locomotive Magazine, Volume IX (12 September 1903), p. 157. Boiler pressure is an estimate.

An assorted class in terms of builders and building dates: Beyer, Peacock supplied 237-238 in 1859, 233-234 in 1861, 235 from Cowlairs as an Edinburgh & Glasgow engine, and 236 and 239 as NBR engines. In their original state, the dome rode on the firebox.

The rebuilding that started in 1881 moved the dome to the center of barrel at the same time that the crew received a narrow sheltering eave extending back from the weatherboard. At the time of writing in 1903, the author noted that this class served mainly the West of Fife section, from Stirling to Dunfermline, Thornton, and Ladybank "'...with light and fast trains, a service which, notwithstanding their age, they still perform in a satisfactory manner."


Class 90 (Locobase 10713)

Data from "The Locomotives of the Great Eastern Railway," The Locomotive Magazine, Vol XV (15 June 1909), p. 107. See also Steamindex ([link], last accessed 2 August 2009). Dubs works numbers were 32-37 in 1866. Neilson's works numbers were 1290-1293, 1297-1299 in 1866 and 1350-1354 in 1867.

Locobase 10712 shows the five engines of this class that went to the Great Eastern.


Class P rebuilt by Reid (Locobase 5204)

Data from "Rebuilt 2-4-0 Passenger Engines, North British Ry", Locomotive Magazine, Volume XXII [22] (15 February 1916), p. 19; and "The Wheatley E7 (NBR Class P) 2-4-0 Locomotives", archived in Richard Marsden's LNER Encyclopedia at [link], last accessed 10 April 2019.

Reid rebuilt six of these little passenger engines in 1915, which Wheatley originally brought into service and Holmes had later rebuilt the first time.

This time, Marsden points out, Reid was reworking locomotives that had been reassigned to local passenger trains and pilot (helper) duties. LNER took over the engines over in 1923 and only briefly, putting three to work on the Berwickshire branch to St Boswells, the other three hauling Fife locals.

Just two years later, the LNER began disposing of the 50-year-old, twice revamped locomotives. 10247 was last to go in 1927 after operating for a year out of Bathgate on the Morningside branch.

Principal Dimensions by Steve Llanso of Middle Run Media
Class23390P rebuilt by Reid
Locobase ID10368 10713 5204
RailroadNorth BritishNorth BritishNorth British
CountryGreat BritainGreat BritainGreat Britain
Whyte2-4-02-4-02-4-0
Number in Class7186
Road Numbers233-239429, 1239, 1245-1249, 1256
GaugeStdStdStd
Number Built718
BuilderseveralseveralCowlairs
Year188118661915
Valve GearStephensonStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 7.75 / 2.36
Engine Wheelbase (ft / m)15 / 4.57
Ratio of driving wheelbase to overall engine wheelbase 0.52
Overall Wheelbase (engine & tender) (ft / m)32.37 / 9.87
Axle Loading (Maximum Weight per Axle) (lbs / kg)24,192 / 10,97332,964 / 14,952
Weight on Drivers (lbs / kg)45,472 / 20,62658,016 / 26,316
Engine Weight (lbs / kg)68,208 / 30,93982,908 / 37,606
Tender Loaded Weight (lbs / kg)40,432 / 18,34058,912 / 26,722
Total Engine and Tender Weight (lbs / kg)108,640 / 49,279141,820 / 64,328
Tender Water Capacity (gals / ML)2064 / 7.82
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)38 / 1948 / 24
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)72 / 182972.50 / 184272 / 1829
Boiler Pressure (psi / kPa)150 / 1030140 / 970150 / 1030
High Pressure Cylinders (dia x stroke) (in / mm)16" x 20" / 406x50816" x 20" / 406x50817" x 24" / 432x610
Tractive Effort (lbs / kg)9067 / 4112.738404 / 3811.9912,283 / 5571.48
Factor of Adhesion (Weight on Drivers/Tractive Effort) 5.41 4.72
Heating Ability
Tubes (number - dia) (in / mm)171 - 1.75" / 44147 - 2.125" / 54202 - 1.75" / 44
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)10.29 / 3.1410.33 / 3.15
Firebox Area (sq ft / m2)66 / 6.1385 / 7.90102 / 9.48
Grate Area (sq ft / m2)15.75 / 1.4614.90 / 1.3816.75 / 1.56
Evaporative Heating Surface (sq ft / m2)924 / 85.87925 / 85.971061 / 98.57
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)924 / 85.87925 / 85.971061 / 98.57
Evaporative Heating Surface/Cylinder Volume198.53198.74168.28
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation236320862513
Same as above plus superheater percentage236320862513
Same as above but substitute firebox area for grate area990011,90015,300
Power L1485049074485
Power MT475.81340.86

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