Great Central 0-8-0 Locomotives in Great_Britain


Class Details by Steve Llanso of Sweat House Media

Class 8A - superheated (Locobase 6415)

Data from Richard Marsden of [link] (visited 11 December 2004). Mike Parkes -- [link], last accessed 26 June 2006.

A deep Belpaire firebox is noticeable as are the outside cylinders tucked under the frame.

Marsden says eight Q4s (Locobase 8407) retained their saturated boilers throughout their working lives. Mike Parkes credits the GCR with superheating 35 boilers by 1916 and the LNER converting an equal number from 1925-1933. Withdrawals began a year later and by 1940 41 had been taken out of service. The remainder carried on in the face of increased traffic demands; Thompson rebuilt 13 as Q1 0-8-0T tank engines in 1942-1945.

After World War II, all but one of the remaining 35 were carried on the British Railway rolls at Nationalization in 1948. In the next three years, these were retired with the last one going in October 1951.


Class 8A Tinies/Q4 (Locobase 8407)

Data from 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) and "New Engines, Great Central Railway," The Locomotive Magazine, Vol VIII (3 Jan 1903), p. 3.

Rendell's entry represents John G Robinson's saturated-steam goods locomotive as introduced in 1902. This heavy mineral engine (drag freighter for coal, iron ore, etc.) used essentially the same boiler as the 4-6-0 Fish engines of the same year (Locobase 6301), but grafted on a deeper firebox with more surface area.

Principal Dimensions by Steve Llanso of Middle Run Media
Class8A - superheated8A Tinies/Q4
Locobase ID6415 8407
RailroadGreat CentralGreat Central
CountryGreat BritainGreat Britain
Whyte0-8-00-8-0
Number in Class7373
Road Numbers
GaugeStdStd
Number Built73
Builder
Year19141902
Valve GearStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)17.08 / 5.2117.08 / 5.21
Engine Wheelbase (ft / m)17.08 / 5.2117.08 / 5.21
Ratio of driving wheelbase to overall engine wheelbase11
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)38,084 / 17,27534,496
Weight on Drivers (lbs / kg)141,120 / 64,011137,200 / 62,233
Engine Weight (lbs / kg)141,120 / 64,011137,200 / 62,233
Tender Loaded Weight (lbs / kg)88,032 / 39,931
Total Engine and Tender Weight (lbs / kg)225,232 / 102,164
Tender Water Capacity (gals / ML)3900 / 14.77
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)59 / 29.5057 / 28.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)57 / 144855 / 1397
Boiler Pressure (psi / kPa)180 / 1240180 / 1240
High Pressure Cylinders (dia x stroke) (in / mm)20" x 26" / 508x66019" x 26" / 483x660
Tractive Effort (lbs / kg)27,916 / 12662.5026,110 / 11843.31
Factor of Adhesion (Weight on Drivers/Tractive Effort) 5.06 5.25
Heating Ability
Tubes (number - dia) (in / mm)94 - 2" / 51202 - 2" / 0
Flues (number - dia) (in / mm)21 - 5.25" / 133
Flue/Tube length (ft / m)
Firebox Area (sq ft / m2)140 / 13.01140 / 13.01
Grate Area (sq ft / m2)23.62 / 2.2023.62 / 2.20
Evaporative Heating Surface (sq ft / m2)1338 / 124.351765 / 164.03
Superheating Surface (sq ft / m2)230 / 21.38
Combined Heating Surface (sq ft / m2)1568 / 145.731765 / 164.03
Evaporative Heating Surface/Cylinder Volume141.53206.87
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation42524252
Same as above plus superheater percentage48894252
Same as above but substitute firebox area for grate area28,98025,200
Power L174304767
Power MT464.29306.40

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