GCR Class 8F

GCR Class 8F LNER B4
B4 4-6-0 No. 1486 at Ardsley Locomotive Depot
Type and origin Power type Steam Designer John G. Robinson Builder Beyer, Peacock and Company Order number BP: 9458 Serial number 4816–4825 Build date June – July 1906 Total produced 10
Specifications Configuration: ​  • Whyte 4-6-0  • UIC 2'Cn2 Gauge 4 ft 8 1⁄2 in (1,435 mm) Leading dia. 3 ft 6 in (1.067 m) Driver dia. 6 ft 7 in (2.007 m) Wheelbase 51 ft 10 in (15.799 m) Length 61 ft 11.25 in (18.879 m) Height 13 ft 0 in (3.962 m) Adhesive weight 54 long tons 18 cwt (123,000 lb or 55.8 t) Loco weight 70 long tons 14 cwt (158,400 lb or 71.8 t) Tender weight 48 long tons 6 cwt (108,200 lb or 49.1 t) Fuel type Coal Fuel capacity 6 long tons 0 cwt (13,400 lb or 6.1 t) Water cap 4,000 imp gal (18,000 l; 4,800 US gal) Boiler: ​  • Diameter 4 ft 9.5 in (1,460 mm) to 5 ft (1,500 mm) Boiler pressure 180 lbf/in2 (1.24 MPa) Heating surface As built: 1,911 sq ft (177.5 m2) Superheated: 1,482 sq ft (137.7 m2)  • Firebox 133 sq ft (12.4 m2) Superheater: ​  • Heating area 242 sq ft (22.5 m2) Cylinders Two, outside Cylinder size As built: 19 in × 26 in (480 mm × 660 mm) B4/1 sub-class: 21 in × 26 in (530 mm × 660 mm) Valve gear Stephenson Valve type Slide, some later 10-inch (254 mm) piston valves
Career Operators GCR →LNER Class GCR: 8F LNER: B4 Numbers GCR: 1095–1104 LNER: 6095–6104, later 1481–1489 Nicknames Immingham Axle load class LNER: Route Availability: 5 Withdrawn February 1944 – November 1950 Disposition All scrapped

The GCR Class 8F was a class of ten 4-6-0 locomotives built for the Great Central Railway in 1906 by Beyer, Peacock and Company to the design of John G. Robinson for working fast goods and fish trains. They passed to the London and North Eastern Railway at the 1923 grouping and received the classification 'B4'.

The new design was very similar to 4-6-0 the two locomotives of the (GCR Class 8C, later LNER class B1) except that they had smaller driving wheels.

They were built with a saturated boiler, inside slide valves and Stephenson valve gear, two outside cylinders connected to 6-foot-7-inch (2.007 m) diameter driving wheels.

The ten locomotives were renumbered by the LNER by adding 5000 to their GCR numbers; and classified as B4.

Between 1925 and 1928 the whole class received superheated boilers, but six received 10-inch piston valves and 21-inch cylinders giving rise to two LNER sub-classes B4/1 and B4/2.

The LNER had designed a new type of superheated boiler (Diagram 16) based on the old design (Diagram 15). These were used on the B1 and B4 class locomotives; no more of this type of boiler was made after 1932, and so to keep the B1 and B4s in service during World War II, some Diagram 15 boilers were modified for use with these locomotives.

The class were originally used on fish trains between the port of Grimsby and London and Manchester although they were also found to be successful passenger locomotives. The first locomotive No. 1095 was also chosen to haul the special train at the inauguration ceremony for the new port of Immingham in 1906, and was named ‘Immingham’ thereafter. After grouping the class was transferred to Ardsley, South Yorkshire and did much useful work in the West Riding of Yorkshire