GWR 4073 Class (English Wikipedia)

"Workings of Royal Special Trains in connection with the Funeral of the late King". The Locomotive Magazine and Railway Carriage and Wagon Review. 42 (522): 42–43. 15 February 1936. Archived from the original on 28 January 2023. Retrieved 14 October 2022.

thornburycastle7027.co.uk

"History of 7027 Thornbury Castle". Castle Class Steam Locomotive Thornbury Castle. Thornbury Castle 7027 Society. 2018. Archived from the original on 22 September 2018.

Defiant Club Archived 14 September 2018 at the Wayback Machine The 5080 Defiant Club

Bestwick, Alex (8 January 2024). "The history of GWR's 'Castle' Class, from design to preservation | The Railway Magazine". Archived from the original on 13 June 2024. Retrieved 26 December 2024.
"Workings of Royal Special Trains in connection with the Funeral of the late King". The Locomotive Magazine and Railway Carriage and Wagon Review. 42 (522): 42–43. 15 February 1936. Archived from the original on 28 January 2023. Retrieved 14 October 2022.
"History of 7027 Thornbury Castle". Castle Class Steam Locomotive Thornbury Castle. Thornbury Castle 7027 Society. 2018. Archived from the original on 22 September 2018.
Defiant Club Archived 14 September 2018 at the Wayback Machine The 5080 Defiant Club

Champ (2018), p. 320. Champ, Jim (2018). An Introduction to Great Western Locomotive Development. Barnsley: Pen & Sword Transport. ISBN 978-1-4738-7784-9. OCLC 1029234106. OL 26953051M.
le Fleming (1953), p. H13. le Fleming, H.M. (July 1953). White, D.E. (ed.). The Locomotives of the Great Western Railway, part eight: Modern Passenger Classes (1st ed.). Kenilworth: RCTS. ISBN 0-901115-19-3. OCLC 41540553. {{cite book}}: ISBN / Date incompatibility (help)
le Fleming (1953), p. H17. le Fleming, H.M. (July 1953). White, D.E. (ed.). The Locomotives of the Great Western Railway, part eight: Modern Passenger Classes (1st ed.). Kenilworth: RCTS. ISBN 0-901115-19-3. OCLC 41540553. {{cite book}}: ISBN / Date incompatibility (help)
le Fleming (1953), p. H17–H18. le Fleming, H.M. (July 1953). White, D.E. (ed.). The Locomotives of the Great Western Railway, part eight: Modern Passenger Classes (1st ed.). Kenilworth: RCTS. ISBN 0-901115-19-3. OCLC 41540553. {{cite book}}: ISBN / Date incompatibility (help)
le Fleming (1953), p. H17–H19. le Fleming, H.M. (July 1953). White, D.E. (ed.). The Locomotives of the Great Western Railway, part eight: Modern Passenger Classes (1st ed.). Kenilworth: RCTS. ISBN 0-901115-19-3. OCLC 41540553. {{cite book}}: ISBN / Date incompatibility (help)
"Light at the end of the tunnel for Severn 'Prairie'". Steam Railway. No. 455. Peterborough: Bauer Consumer Media Ltd. 17 June 2016. pp. 40–42. ISSN 0143-7232.