The North Eastern Railway Class S (LNER Class B13) was a 4-6-0 type of steam locomotive designed for express passenger workings.

They were very similar to the NER Class S1, except for the smaller wheels of the former.

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.

This article relating to steam locomotives operated in England is a stub.