LMS 0-8-0 Locomotives in Great_Britain


Class Details by Steve Llanso of Sweat House Media

Class Class 7F (Locobase 3762)

Data from Bryan Attewell ([link] Steam locomotive simulator (April 2000 edition), corrected and supplemented by [link], last accessed 10 May 2008. Glover (1967) says this is Sir Henry Fowler's update of a London & North Western mineral engine that used a Belpaire boiler like its predecessor. It was that engine, he says, that was the last inside-cylinder 0-8-0s produced in Great Britain.

A photograph (seen at [link], visited Nov 2002) shows a stolid, straight-barrelled, high-pitched boiler with a tiny stack and dome, heavy plate frame, and 6-wheeled tender with outside springs. Heating surface area later was reduced by 32 sq ft (2.9 sq m) to 1,402 sq ft with a commensurate reduction in superheater area of 15 sq ft (1.4 sq m) to 338 sq ft.

Steamindex's compilation -- [link] (seen 20 Oct 2004) -- reveals to Locobase that this class was called the "Austin Sevens". Moreover, steamindex cites Bill Aves's article "The LMS 7F 0-8-0s - 'Austin Sevens': unnecessary and Perverse? Br. Rlys ill, 1995, 4, 358-67. and summarizes: "Despite having long travel valves and inside Walschaerts valve gear and a boiler based on that of the LNWR 0-8-0s the design was unsatisfactory due to a long wheel base coupled with inferior Derby axleboxes and bearings which were always running hot. Aves argues that the LMS should have made better use of the ROD 2-8-0s which it had purchased."

WG Thorley's book A Breath of Steam is quoted about the mechanical breakdowns this class suffered: "connecting rod little end bush wear was very heavy, it was impossible to keep gudgeon pin nuts tight for more than a few days, and longitudinal fractures developed in the gudgeon pins themselves." Thorley added, however: "It redeemed itself only by good steaming qualities and efficient use of the steam when in service."

According to [link] (Nov 2002, data from [link]), the production batches ran as follows:

Lot Year Engine #s

57 1928 49500-49599

71 1930 49600-49619

81 1931 49620-49659

84 1932 49660-49674

First withdrawals came in 1949 and continued until the last two retired in 1961.

Principal Dimensions by Steve Llanso of Middle Run Media
ClassClass 7F
Locobase ID3762
RailroadLMS
CountryGreat Britain
Whyte0-8-0
Number in Class175
Road Numbers9600-9774
GaugeStd
Number Built175
BuilderL&NW - Crewe
Year1929
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)18.25 / 5.56
Engine Wheelbase (ft / m)18.25 / 5.56
Ratio of driving wheelbase to overall engine wheelbase1
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)136,080 / 61,725
Engine Weight (lbs / kg)136,080 / 61,725
Tender Loaded Weight (lbs / kg)92,288 / 41,861
Total Engine and Tender Weight (lbs / kg)228,368 / 103,586
Tender Water Capacity (gals / ML)4200 / 15.91
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 4.50 / 4.10
Minimum weight of rail (calculated) (lb/yd / kg/m)57 / 28.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)56.50 / 1435
Boiler Pressure (psi / kPa)200 / 1380
High Pressure Cylinders (dia x stroke) (in / mm)19.5" x 26" / 495x660
Tractive Effort (lbs / kg)29,747 / 13493.03
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.57
Heating Ability
Tubes (number - dia) (in / mm)
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)14.75 / 4.50
Firebox Area (sq ft / m2)150 / 13.94
Grate Area (sq ft / m2)23.50 / 2.18
Evaporative Heating Surface (sq ft / m2)1434 / 133.22
Superheating Surface (sq ft / m2)353 / 32.79
Combined Heating Surface (sq ft / m2)1787 / 166.01
Evaporative Heating Surface/Cylinder Volume159.56
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation4700
Same as above plus superheater percentage5640
Same as above but substitute firebox area for grate area36,000
Power L111,235
Power MT728.07

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