Great North of Scotland 0-6-0 Locomotives in Great_Britain

Class Details by Steve Llanso of Sweat House Media

Class D, E/ J90, J91 (Locobase 6418)

Data from H A Vallance The Great North of Scotland Railway (1968 reprint, p 155) and the [] website of the Great North of Scotland Railway Association (visited 8 Dec 2004). Vallance shows a total heating surface of 756 sq ft. The data in the specifications is from Richard Marsden's LNER Encyclopedia, [], last accessed 25 Sept 2006.

These little side tanks were intended for switching and helper service, but they worked well on the Aberdeen commuter runs despite the demands of a tight schedule. The 3 in 1885 were a bit larger and weighed one more ton, but were otherwise similar. In 1907 all 9 were rebuilt with 846-sq ft boilers pressed to 150 psi.

In LNER service the 1884 batch were J90, the 1885s J91. The last J90 was withdrawn in 1936, the last J91 2 years earlier.

Principal Dimensions by Steve Llanso of Sweat House Media

ClassD, E/ J90, J91
Locobase ID6418
RailroadGreat North of Scotland
CountryGreat Britain
Number in Class9
Road Numbers
Number Built9
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)13.67 / 4.17
Engine Wheelbase (ft / m)13.67 / 4.17
Ratio of driving wheelbase to overall engine wheelbase1
Overall Wheelbase (engine & tender) (ft / m)13.67 / 4.17
Axle Loading (Maximum Weight per Axle) (lbs / kg)35,280 / 16,003
Weight on Drivers (lbs / kg)96,880 / 43,944
Engine Weight (lbs / kg)96,880 / 43,944
Tender Loaded Weight (lbs / kg)76,160 / 34,546
Total Engine and Tender Weight (lbs / kg)173,040 / 78,490
Tender Water Capacity (gals / ML)1080 / 4.09
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 1.70 / 2
Minimum weight of rail (calculated) (lb/yd / kg/m)54 / 27
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)54 / 1372
Boiler Pressure (psi / kPa)150 / 10.30
High Pressure Cylinders (dia x stroke) (in / mm)16" x 24" / 406x610
Tractive Effort (lbs / kg)14,507 / 6580.27
Factor of Adhesion (Weight on Drivers/Tractive Effort) 6.68
Heating Ability
Tubes (number - dia) (in / mm)158 - 1.75" / 44
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)
Firebox Area (sq ft / m2)71.80 / 6.67
Grate Area (sq ft / m2)14.82 / 1.38
Evaporative Heating Surface (sq ft / m2)846 / 78.62
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)846 / 78.62
Evaporative Heating Surface/Cylinder Volume151.48
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2223
Same as above plus superheater percentage2223
Same as above but substitute firebox area for grate area10,770
Power L12913
Power MT198.87

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Wes Barris