William Paton Reid, CBE (8 September 1854 – 2 February 1932) was apprenticed to the Cowlairs railway works of the North British Railway in 1879 and was Locomotive Superintendent from 1903 to 1919. He was appointed a CBE in 1920. He was born, and died, in Glasgow, Scotland. Prior to his appointment, he had been Assistant Locomotive Superintendent to his predecessor, Matthew Holmes.

Locomotives

Reid modernised and rebuilt existing engines and introduced superheating to the North British Railway. New locomotives designed by him include: Some of the NBR classes had several variants. The NBR did not distinguish between the variants but the LNER did. The figures 6' 6" or 6' 0" indicate the driving wheel diameter.