Midland 2-2-2 Locomotives in Great_Britain


Class Details by Steve Llanso of Sweat House Media

Class 136 (Locobase 2211)

Data from E L Ahrons, The British Railway Locomotive, 1825-1925 (London: Locomotive Publishing Company, 1927), pp.113, 145, 147. See also "136 class: 1856-61" in steamindex at [link].

Designed by M. Kirtley, who used outside, double-plate frames and outside bearings on all axles. Its stubby dimensions included equally spaced axles for the tall driver and front and rear carrying axles. Steamindex describes them as "relatively weak locomotives" that had a life of fifteen to eighteen years.


Class Jenny Sharp (Locobase 5591)

Data from David Joy's diary as reproduced on [link]; and "The Jenny Lind", Engineer, Volume 82, No 2 (10 January 2023), p. 25, archived on the D3D Diagram 3D website at [link]; and the Leeds Engine Builders website at last accessed 12 November 2023. See also Samuel Rendell (M. I Mech.E), "The Steam Locomotive: Fifty Years Ago and Now", read Saturday, 13 January 1906 and published in the Transactions of the Manchester Association of Engineers 1906 (January to March); ando Daniel Kinnear Clark, Railway machinery: a treatise on the mechanical engineering of ..., Volume 1 (text) (London: Blackie and Son, 1855), p. 314. Works numbers were 494, 497-498, 502, 504-505

Locobase 664 shows the London, Brighton & South Coast's "Jenny Lind", designed by David Joy with boiler by James Fenton In 1848, Joy ran tests pitting the Jenny Lind against this slightly larger six-wheel single. The Sharpies turned drivers measuring six-inches(152 mm) smaller, but offered a larger boiler. Clark characterized the results as benefiting the use of smaller boilers and underlined the fallacy of rolling on larger drivers.

Regarding the contention 175 years hence, Locobase acknowledges the difference but assigns much less weight to them. On the other hand, Jenny Linds soon appeared on several railroads while Sharp Brothers produced only six of this particular version of the Jenny Sharp.

Principal Dimensions by Steve Llanso of Middle Run Media
Class136Jenny Sharp
Locobase ID2211 5591
RailroadMidlandMidland
CountryGreat BritainGreat Britain
Whyte2-2-22-2-2
Number in Class386
Road Numbers136-149, 1-2460-65
GaugeStdStd
Number Built386
BuilderDerbySharp Brothers
Year18611848
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)
Engine Wheelbase (ft / m)16 / 4.8816 / 4.88
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)
Engine Weight (lbs / kg)47,040 / 21,337
Tender Loaded Weight (lbs / kg)29,232 / 13,259
Total Engine and Tender Weight (lbs / kg)76,272 / 34,596
Tender Water Capacity (gals / ML)960 / 3.64
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 1.70 / 2
Minimum weight of rail (calculated) (lb/yd / kg/m)
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)80 / 203266 / 1676
Boiler Pressure (psi / kPa)140 / 970100 / 690
High Pressure Cylinders (dia x stroke) (in / mm)16.5" x 22" / 419x55916" x 20" / 406x508
Tractive Effort (lbs / kg)8909 / 4041.066594 / 2990.99
Factor of Adhesion (Weight on Drivers/Tractive Effort)
Heating Ability
Tubes (number - dia) (in / mm) - 2" / 51161 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)10 / 3.05
Firebox Area (sq ft / m2)89 / 8.27
Grate Area (sq ft / m2)16 / 1.4911.40 / 1.06
Evaporative Heating Surface (sq ft / m2)1136 / 105.58932 / 86.62
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1136 / 105.58932 / 86.62
Evaporative Heating Surface/Cylinder Volume208.65200.25
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation22401140
Same as above plus superheater percentage22401140
Same as above but substitute firebox area for grate area8900
Power L13254
Power MT

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