Davies 1956, p. L14. Davies, F.K. (May 1956) [1952]. White, D.E. (ed.). The Locomotives of the Great Western Railway, part eleven: The Rail Motor Vehicles and Internal Combustion Locomotives (2nd ed.). RCTS. ISBN0-901115-38-X. OCLC655440794. {{cite book}}: ISBN / Date incompatibility (help)