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
- Dugald Drummond
- North British Railway 1875-1882
- Caledonian Railway 1882-1890
- London and South Western Railway 1895-1912
- 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
- Matthew Holmes
- North British Railway 1882-1903
- John F. McIntosh
- Caledonian Railway 1895-1914
- William Pickersgill
- Great North of Scotland Railway 1894-1914
- Caledonian Railway 1914-1923
- Vincent Raven
- North Eastern Railway, 1910-1922
- William P. Reid
- North British Railway, 1903-1919
- J. G. Robinson
- Great Central Railway, 1900-1922
- William Stanier
- London, Midland and Scottish Railway, 1932-1944
- Matthew Stirling
- Hull & Barnsley Railway, ?-1922
- Patrick Stirling
- Great Northern Railway, 1866-?
