Data from "New Locomotives, Great Central Railway", The Locomotive, Volume 16 (15 November 1910), p. 237; and Volume 17 (15 December 1911), p. 256.
Fitted from the start with a superheater and, like most British engines of the time, fitted with a Belpaire firebox, these Consolidations used many of the same components as did the earlier 0-8-0s. The boiler was essentially identical to the Atlantic boiler.
Data from Richard Marsden, "The Robinson O4 (ROD) and O5 (GCR 8K and 8M) 2-8-0s", on the LNER Encyclopedia website at [], last accessed 19 July 2019; and Ahrons (1927).
JG Robinson two-cylinder (outside) Consolidation for freight slogging. See Ahrons (1927) for data. Thus was such a successful design that it became the model for the Ministry of War's Railroad Operating Department (ROD) Consolidations; see the full account at Locobase 2742.
This 8M (the LNER designation O5 was assigned upon the 1923 Grouping) is the later design with a slightly larger higher-pressure boiler.
Principal Dimensions by Steve Llanso of Sweat House Media | |||
---|---|---|---|
Class | 8K/O4 | 8M/O5 | 8M/O5 - 42 elements |
Locobase ID | 16004 | 2347 | 16005 |
Railroad | Great Central | Great Central | Great Central |
Country | Great Britain | Great Britain | Great Britain |
Whyte | 2-8-0 | 2-8-0 | 2-8-0 |
Number in Class | 129 | 19 | |
Road Numbers | 412-415 | ||
Gauge | Std | Std | Std |
Number Built | 129 | 19 | |
Builder | Gorton | ||
Year | 1911 | 1918 | 1923 |
Valve Gear | Stephenson | Stephenson | Stephenson |
Locomotive Length and Weight | |||
Driver Wheelbase (ft / m) | 17.08 / 5.21 | 17.09 / 5.21 | 17.09 / 5.21 |
Engine Wheelbase (ft / m) | 25.33 / 7.72 | 25.42 / 7.75 | 25.42 / 7.75 |
Ratio of driving wheelbase to overall engine wheelbase | 0.67 | 0.67 | 0.67 |
Overall Wheelbase (engine & tender) (ft / m) | 50.75 / 15.47 | ||
Axle Loading (Maximum Weight per Axle) (lbs / kg) | 36,960 / 16,765 | ||
Weight on Drivers (lbs / kg) | 147,840 / 67,059 | 152,096 / 68,990 | 152,096 / 68,990 |
Engine Weight (lbs / kg) | 162,400 / 73,663 | 168,448 / 76,407 | 168,448 / 76,407 |
Tender Loaded Weight (lbs / kg) | 103,376 / 46,891 | ||
Total Engine and Tender Weight (lbs / kg) | 265,776 / 120,554 | ||
Tender Water Capacity (gals / ML) | 4800 / 18.18 | ||
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 5.50 / 5 | ||
Minimum weight of rail (calculated) (lb/yd / kg/m) | 62 / 31 | 63 / 31.50 | 63 / 31.50 |
Geometry Relating to Tractive Effort | |||
Driver Diameter (in / mm) | 56 / 1422 | 56 / 1422 | 56 / 1422 |
Boiler Pressure (psi / kPa) | 180 / 12.40 | 180 / 12.40 | 180 / 12.40 |
High Pressure Cylinders (dia x stroke) (in / mm) | 21" x 26" / 533x660 | 21" x 26" / 533x660 | 21" x 26" / 533x660 |
Tractive Effort (lbs / kg) | 31,327 / 14209.71 | 31,327 / 14209.71 | 31,327 / 14209.71 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.72 | 4.86 | 4.86 |
Heating Ability | |||
Tubes (number - dia) (in / mm) | 144 - 2" / 51 | 116 - 2.25" / 57 | 67 - 2.25" / 57 |
Flues (number - dia) (in / mm) | 18 - 5.25" / 133 | 28 - 5.25" / 133 | 98 - 3" / 76 |
Flue/Tube length (ft / m) | 15 / 4.57 | 15.36 / 4.68 | 17.25 / 5.26 |
Firebox Area (sq ft / m2) | 153 / 14.21 | 174 / 16.16 | 174.50 / 16.21 |
Grate Area (sq ft / m2) | 25 / 2.32 | 26 / 2.42 | 26.24 / 2.44 |
Evaporative Heating Surface (sq ft / m2) | 1691 / 157.10 | 1815 / 168.62 | 1767 / 164.16 |
Superheating Surface (sq ft / m2) | 198 / 28.61 | 308 / 28.61 | 570 / 52.95 |
Combined Heating Surface (sq ft / m2) | 1889 / 185.71 | 2123 / 197.23 | 2337 / 217.11 |
Evaporative Heating Surface/Cylinder Volume | 162.24 | 174.14 | 169.53 |
Computations Relating to Power Output (More Information) | |||
Robert LeMassena's Power Computation | 4500 | 4680 | 4723 |
Same as above plus superheater percentage | 4950 | 5382 | 5857 |
Same as above but substitute firebox area for grate area | 30,294 | 36,018 | 38,948 |
Power L1 | 6831 | 8796 | 12,523 |
Power MT | 407.46 | 509.99 | 726.08 |