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Description
Sir Vincent Raven, upon becoming the North Eastern Railway's Chief Mechanical Engineer in 1910, set to designing a more powerful mixed traffic 4-6-0 not unlike the Worsdell classes S and S1. The S2 was designed and produced at Darlington from 1911 to 1913, with the class total at 20 engines. The first seven were built with saturated boilers and the other thirteen had 24 element Robinson Superheaters. One, number 925, was built with Stumpf uniflow cylinders. In LNER ownership, the B15s were gradually replaced on mixed traffic on the former North Eastern Railway network by three cylinder B16s and C7s. The first withdrawal in 1937, but due to the motive power shortage of the Second World War, this was stopped, though it started again and by 1947 all were gone and none are preserved.

Description
Sir Vincent Raven, upon becoming the North Eastern Railway's Chief Mechanical Engineer in 1910, set to designing a more powerful mixed traffic 4-6-0 not unlike the Worsdell classes S and S1. The S2 was designed and produced at Darlington from 1911 to 1913, with the class total at 20 engines. The first seven were built with saturated boilers and the other thirteen had 24 element Robinson Superheaters. One, number 925, was built with Stumpf uniflow cylinders. In LNER ownership, the B15s were gradually replaced on mixed traffic on the former North Eastern Railway network by three cylinder B16s and C7s. The first withdrawal in 1937, but due to the motive power shortage of the Second World War, this was stopped, though it started again and by 1947 all were gone and none are preserved.