Lancashire & Yorkshire 2-4-2 Locomotives in Great_Britain


Class Details by Steve Llanso of Sweat House Media

Class 5 (Locobase 3212)

Data from "Tank Locomotive for the Lancashire & Yorkshire Railway", Railroad and Engineering Journal, Volume 64, No 11 (November 1890), pp. 496-497; and "L&YR Class 5" in Wikipedia at [], last accessed 12 February 2023. (Thanks to Alexander Blessing for his 5 February 2023 email providing the RREJarticle cited above.)

John Aspinall introduced these tank engines, which, says Glover (1967), "performed work which might well have seemed impossible for engines of such relatively small dimensions." Some batches had 17 1/2" (445 mm) diameter cylinders. The first 210 locomotives used short frames; beginning in 1898, the frames allowed for more water and coal storage. Engine weight increased to 132,500 lb (61,000 kg).

Hughes's batches (produced 1904 and later) used Belpaire fireboxes and extended smokeboxes.

According to David Fryer, in his submission to Bryan Attewell ([] locomotive simulator -- [] (July 2001) all of these tanks became LMS engines in the mid-1920s and 105 survived to work for British Rail after World War II. Data supplemented and corrected by article in November 1890 RREJ.


Class 6 (Locobase 2309)

Data from Ahrons (1927); "L&YR Class 5" in Wikipedia at [], last accessed 12 February 2023; and "Railway Notes - Lancashire & Yorkshire", Locomotive Magazine, Volume 18, No 239 (15 July 1912), p.

George Hughes superheated 46 of Aspinall's 2-4-2Ts and produced 18 more with Belpaire fireboxes and extended smokeboxes. The data given by Ahrons show a very high boiler demand factor. LM's report shows a slightly larger boiler heating surface area that does little to reduce this ratio. On the other hand, the firebox heating surface is considerable, cylinder diameter increased by 2 1/2" (63.75 mm), and larger big-end bearings. .

According to David Fryer, in his submission to Bryan Attewell ([] locomotive simulator -- [] (July 2001) -- the class endured for quite some time. After a derailment showed the folly of using a tank engine for high-speed mainline service, they soldiered on in secondary roles. All became LMS engines in the mid-1920s and 8 served British Railways after World War II.

The last of the class retired in 1961.

Principal Dimensions by Steve Llanso of Middle Run Media

Class56
Locobase ID3212 2309
RailroadLancashire & YorkshireLancashire & Yorkshire
CountryGreat BritainGreat Britain
Whyte2-4-2T2-4-2T
Number in Class31044
Road Numbers
GaugeStdStd
Number Built31018
BuilderHorwichHorwich
Year18891911
Valve GearJoyJoy
Locomotive Length and Weight
Driver Wheelbase (ft / m) 8.58 / 2.62 8.58 / 2.62
Engine Wheelbase (ft / m)24.33 / 7.4224.33 / 7.42
Ratio of driving wheelbase to overall engine wheelbase 0.35 0.35
Overall Wheelbase (engine & tender) (ft / m)24.3324.33 / 7.42
Axle Loading (Maximum Weight per Axle) (lbs / kg)39,200 / 17,78144,128 / 20,016
Weight on Drivers (lbs / kg)71,120 / 32,26087,920 / 39,880
Engine Weight (lbs / kg)125,328 / 57,661148,848 / 67,516
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)125,328 / 57,661148,848 / 67,516
Tender Water Capacity (gals / ML)1610 / 5.081848 / 7
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 2.25 / 3.207 / 6
Minimum weight of rail (calculated) (lb/yd / kg/m)59 / 29.5073 / 36.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)68 / 172768 / 1727
Boiler Pressure (psi / kPa)160 / 11180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)18" x 26" / 457x66020.5" x 26" / 521x660
Tractive Effort (lbs / kg)16,848 / 7642.1324,585 / 11151.58
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.22 3.58
Heating Ability
Tubes (number - dia) (in / mm)220 - 1.75" / 44116 - 1.75" / 44
Flues (number - dia) (in / mm)18 - 4.75" / 121
Flue/Tube length (ft / m)11 / 3.3510.75 / 3.28
Firebox Area (sq ft / m2)107.68 / 10107.36 / 9.97
Grate Area (sq ft / m2)18.75 / 1.7418.75 / 1.74
Evaporative Heating Surface (sq ft / m2)1216 / 112.97920 / 85.47
Superheating Surface (sq ft / m2)195 / 18.12
Combined Heating Surface (sq ft / m2)1216 / 112.971115 / 103.59
Evaporative Heating Surface/Cylinder Volume158.8092.63
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation30003375
Same as above plus superheater percentage30003949
Same as above but substitute firebox area for grate area17,22922,610
Power L141546597
Power MT257.54330.84

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