The London and North Eastern Railway (LNER) D41 class was a type of 4-4-0 steam locomotive inherited from the Great North of Scotland Railway (GNSR).

The class consisted of two similar GNSR classes: 'S' (introduced in 1893 and designed by James Johnson) and 'T' (introduced in 1895 and designed by William Pickersgill).

The two classes were similar but with detail differences to the boiler.

[1] In December 1893 six locomotives were supplied by Neilson (works nos.

[2] Between December 1895 and February 1898 a further twenty six locomotives were supplied in two batches by Neilson (works nos.