Great Eastern Railway (GER) Class S69, also known as 1500 Class, and later classified B12 by the LNER is a class of 4-6-0 steam locomotive designed for passenger work.

Originally they were designed by S. D. Holden, but were much rebuilt, resulting in several subclasses. Seventy-one S69 locomotives were built by the GER between 1911 and 1921 and numbered 1500–1570. A further 10 locomotives were built by Beyer, Peacock amp; Co for the LNER in 1928 and numbered 8571-8580. From 1948 the British Railways numbers were 61500–61580 (with gaps).These locomotives are considered by some as the finest steam locomotives to haul express passenger trains out of London's Liverpool Street station.