Great Central 2-6-4 Locomotives in Great_Britain

Class Details by Steve Llanso of Sweat House Media

Class 1B/L1/L3 (Locobase 2363)

For data see "New Mineral Tank Engine, GCR", Locomotive Magazine, Volume XX [20] (15 October 1914), pp.258-259; and "2-6-4 Tank Engines, Great Central Ry.", Locomotive Magazine, Volume XXI [21], No 271 (15 March 1915). See also "The Robinson L1/L3 (GCR Class 1B) 2-6-4T Locomotives" entry from Richard Marsden's LNER Encyclopedia, last accessed at [], 27 November 2017.

JG Robinson inside-cylinder Baltic tank with a Belpaire firebox and 10" (254 mm) piston valves. According to Richard Marsden, this class was based on Class M 0-6-4Ts. He notes that the inside cylinder position caused great stress on the frame and made the cylinders and the ash pans difficult to reach. Marsden adds an style critique: "As with most British 2-6-4T designs, the L1s looked impressive. However, they did not rank amongst Robinson's most aesthetic designs, and they were quickly nicknamed 'Crabs'."

The design was originally intended for coal traffic over the 80 miles (129 km) between Nottinghamshire and Derbyshire collieries and the coal docks as Immingham, but its braking system proved insufficient. As a result the class was moved around the system hauling other types of coal trains.

Although not truly satisfactory, they were adequate and 19 survived to operate on British Rail. Retirements spanned 1949-1957.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID2363
RailroadGreat Central
CountryGreat Britain
Number in Class20
Road Numbers
Number Built20
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)17 / 5.18
Engine Wheelbase (ft / m)37.50 / 11.43
Ratio of driving wheelbase to overall engine wheelbase 0.45
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)44,800 / 20,321
Weight on Drivers (lbs / kg)131,600 / 59,693
Engine Weight (lbs / kg)215,936 / 97,947
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)215,936 / 97,947
Tender Water Capacity (gals / ML)3000 / 11.36
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)73 / 36.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)61 / 1549
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)21" x 26" / 533x660
Tractive Effort (lbs / kg)28,759 / 13044.88
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.58
Heating Ability
Tubes (number - dia) (in / mm)157 - 1.875" / 48
Flues (number - dia) (in / mm)24 - 5.25" / 133
Flue/Tube length (ft / m)12.61 / 5.26
Firebox Area (sq ft / m2)157 / 14.59
Grate Area (sq ft / m2)26.50 / 2.46
Evaporative Heating Surface (sq ft / m2)1547 / 143.40
Superheating Surface (sq ft / m2)304 / 19.42
Combined Heating Surface (sq ft / m2)1851 / 162.82
Evaporative Heating Surface/Cylinder Volume148.42
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation4770
Same as above plus superheater percentage5533
Same as above but substitute firebox area for grate area32,782
Power L18898
Power MT447.19

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