LNER 0-8-4 Locomotives in Great_Britain

Class Details by Steve Llanso of Sweat House Media

Class S1 - superheated (Locobase 8916)

Data from Richard Marsden, "The Robinson Class S1 0-8-4 Tank Locomotives" on his LNER Encyclopedia website at [], last accessed 23 July 2023; and "GCR/LNER Robinson "S1" Class 0-8-4T", BRDatabase website at

[], last accessed 23 July 2023. (Thanks to Alex Blessing for his 13 July 2023 email noting the correct LNER class ID.) , accessed 22 November 2007).

Locobase 4192 describes the saturated-steam version of this purpose-built hump shunter.

Marsden wrote that after the LNER took over the quartet as Class S1, they built two more in 1932 with trailing-bogie boosters as class S1/3. These boosters were designed to operate in either direction; such a requirement was rare.

"It appears that the boosters had problems running in reverse", wrote Marsden. "The boosters were rarely used in the reverse direction, and after one month of operation No. 6171's booster was amended so that reverse was disabled. The S1/3 engines had their reversing latches removed from the boosters, so that it was impossible to engage the boosters in the reverse direction."

Like the earlier H8s, all three cylinders got their steam from slide valves. When the S1/1 boilers reached the end of their operating lives, Gorton Works produced three more superheated boilers

Once Gresley left and Thompson could manage it, the boosters on the S1/3s and the one S1/2 (a conversion of 6171) were removed in 1943.

Withdrawals began in 1954 and were completed in 1956-1957.

Principal Dimensions by Steve Llanso of Sweat House Media

ClassS1 - superheated
Locobase ID8916
CountryGreat Britain
Number in Class6
Road Numbers
Number Built2
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)17.19 / 5.24
Engine Wheelbase (ft / m)31.17 / 9.50
Ratio of driving wheelbase to overall engine wheelbase 0.55
Overall Wheelbase (engine & tender) (ft / m)31.17 / 9.50
Axle Loading (Maximum Weight per Axle) (lbs / kg)43,456 / 19,711
Weight on Drivers (lbs / kg)169,456 / 76,864
Engine Weight (lbs / kg)233,520 / 105,923
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)233,520 / 105,923
Tender Water Capacity (gals / ML)3216 / 12.18
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 6.60 / 6
Minimum weight of rail (calculated) (lb/yd / kg/m)71 / 35.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)56 / 1422
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)18" x 26" / 457x660 (3)
Tractive Effort (lbs / kg)34,523 / 15659.39
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.91
Heating Ability
Tubes (number - dia) (in / mm)
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)15.33 / 4.67
Firebox Area (sq ft / m2)151 / 14.03
Grate Area (sq ft / m2)26.54 / 2.47
Evaporative Heating Surface (sq ft / m2)1500 / 139.35
Superheating Surface (sq ft / m2)242 / 22.48
Combined Heating Surface (sq ft / m2)1742 / 161.83
Evaporative Heating Surface/Cylinder Volume130.59
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation4777
Same as above plus superheater percentage5446
Same as above but substitute firebox area for grate area30,985
Power L16484
Power MT337.43

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