NER Class X

NER Class X LNER Class T1
No. 69919 at Stockton Locomotive Depot 1954
Type and origin Power type Steam Designer Wilson Worsdell Builder NER Gatehead Works (10) Darlington Works (5) Build date 1909–1910 (10) and 1925 (5) Total produced 15
Specifications Configuration: ​  • Whyte 4-8-0T  • UIC 2′D n2t Gauge 4 ft 8+1⁄2 in (1,435 mm) Leading dia. 3 ft 1+1⁄4 in (0.946 m) Coupled dia. 4 ft 7+1⁄4 in (1.403 m) Wheelbase 29 ft 0 in (8.839 m) Length 42 ft 1 in (12.827 m) Axle load 18.00 long tons (18.29 t) Adhesive weight 67.60 long tons (68.68 t) Loco weight 85.40 long tons (86.77 t) Fuel type Coal Fuel capacity 4.25 long tons (4.32 t) Water cap. 2,500 imp gal (11,000 L; 3,000 US gal) Firebox: ​  • Grate area 23 sq ft (2.1 m2) Boiler pressure 175 lbf/in2 (1.21 MPa) Heating surface: ​  • Firebox 127 sq ft (11.8 m2)  • Tubes 1,168 sq ft (108.5 m2)  • Total surface 1,295 sq ft (120.3 m2) Cylinders Three Cylinder size 18 in × 26 in (457 mm × 660 mm) Valve gear Stephenson Valve type 8+3⁄4-inch (222 mm) piston valves
Performance figures Tractive effort 34,080 lbf (151.6 kN)
Career Operators North Eastern Railway London and North Eastern Railway British Railways Power class BR: 7F, 5F from May 1953 Axle load class LNER/BR: Route availability 8 Withdrawn 1937, 1955–1961 Disposition All scrapped

The NER Class X (LNER Class T1) was a class of 4-8-0T tank locomotive designed by Wilson Worsdell for the North Eastern Railway.^[1] They were intended for use as powerful shunting engines to arrange and move coal wagons for loading into ships.^[1] In total 15 were built, 10 by the NER between 1909 and 1910, and a further five in 1925 by the London and North Eastern Railway (LNER).^[1] They had three cylinders with divided drive: the inside cylinder driving the leading axle, the outside cylinders driving the centre.^[2]