The North Eastern Railway Class S (LNER Class B13) was a 4-6-0 type of steam locomotive designed for express passenger workings. The first example was built in 1899. They were very similar to the NER Class S1, except for the smaller wheels of the former.

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Quick Facts NER Class S LNER Class B13, Type and origin ...

NER Class S LNER Class B13
2010 with the Royal Train (Date and location unknown)
Type and origin Power type Steam Designer Wilson Worsdell Builder Gateshead Works Build date 1899–1909 Total produced 40
Specifications Configuration: ​  • Whyte 4-6-0  • UIC 2′C n2, later 2′C h2 Leading dia. 3 ft 7+1⁄4 in (1.099 m) Coupled dia. 6 ft 1+1⁄4 in (1.861 m) Wheelbase 50 ft 8+1⁄4 in (15.450 m) ​  • Engine 26 ft 0+1⁄2 in (7.938 m)  • Tender 12 ft 8 in (3.861 m) Length 61 ft 0+3⁄4 in (18.612 m)[1] Axle load 19.70 long tons (20.02 t) Adhesive weight 48.10 long tons (48.87 t) Loco weight 64.30 long tons (65.33 t) Tender weight 43.50 long tons (44.20 t) Total weight 107.80 long tons (109.53 t) Fuel capacity 5.00 long tons (5.08 t) Water cap. 3,940 imp gal (17,900 L; 4,730 US gal) Firebox: ​  • Grate area 23 sq ft (2.1 m2) Boiler LNER diagram 54 Boiler pressure 160 psi (1.1 MPa) Heating surface: ​  • Firebox 120 sq ft (11 m2)  • Tubes 884 sq ft (82.1 m2)  • Flues 379 sq ft (35.2 m2)  • Total surface 1,659 sq ft (154.1 m2) Superheater: ​  • Type Schmidt  • Heating area 276 sq ft (25.6 m2) Cylinders Two, outside Cylinder size 20 in × 26 in (508 mm × 660 mm) Valve gear Stephenson Valve type 8+3⁄4-inch (222 mm) piston valves (first 8 built with sides valves, but altered 1901–21)
Performance figures Tractive effort 19,309 lbf (85.89 kN)
Career Operators North Eastern Railway London & North Eastern Railway Withdrawn 1928–1938 Disposition All scrapped

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They were designed to reduce double heading on the East Coast Main Line. However they steamed poorly, with a smaller and shallower grate than was used even by other locomotives at the time (a problem which also affected the B14s and later, the B15s), and the 4-4-0s of the NER Class R quickly replaced them, with the 4-4-2 layout being preferred for later express passenger designs. The class were re-classified as London and North Eastern Railway Class B13 in 1923.

The first seven locomotives had slide valves, while the remainder had piston valves. The slide valve engines were later fitted with piston valves. Schmidt superheaters were fitted between 1913 and 1925.^[2]

They were withdrawn between 1928 and 1938.