Chief Mechanical Engineer and Locomotive Superintendent are titles applied by British railway companies to persons in charge of building or maintaining locomotives. Here are some examples:

• O. V. S. Bulleid
  • Southern Railway, 1937-1948

• George Jackson Churchward
  • Great Western Railway, 1902-1921

• Henry Fowler
  • Midland Railway, 1909-1923
  • London, Midland and Scottish Railway, 1925-1931

• Daniel Gooch
  • Great Western Railway, 1837-1864

• John Viret Gooch
  • London and South Western Railway, 1841-1850

• Nigel Gresley
  • Great Northern Railway, 1911-1922
  • London and North Eastern Railway, 1923-1941

• Vincent Raven
  • North Eastern Railway, 1910-1922

• J. G. Robinson
  • Great Central Railway, 1900-1922

• William Stanier
  • London, Midland and Scottish Railway, 1932-1944