Sources differ about the running of the first 'inner circle' services. Jackson 1986, p. 56 says the operation was shared equally, whereas Lee 1956, pp. 28–29 states the Met ran all the services. Jackson, Alan (1986). London's Metropolitan Railway. David & Charles. ISBN0-7153-8839-8. Lee, Charles E. (1956). The Metropolitan District Railway. The Oakwood Press. ASINB0000CJGHS.
Lee (1956), p. 7. Lee, Charles E. (1956). The Metropolitan District Railway. The Oakwood Press. ASINB0000CJGHS.
Betjeman, John (1954). A Few Late Chrysanthemums. John Murray. ASINB0000CIW48.
archive.org
The company promoted itself as "The Met" from about 1914.[1] The Railway is referred to as "the Met" or "the Metropolitan" in historical accounts such as Jackson 1986, Simpson 2003, Horne 2003, Green 1987, and Bruce 1983. Jackson, Alan (1986). London's Metropolitan Railway. David & Charles. ISBN0-7153-8839-8. Simpson, Bill (2003). A History of the Metropolitan Railway. Volume 1: The Circle and Extended Lines to Rickmansworth. Lamplight Publications. ISBN1-899246-07-X. Horne, Mike (2003). The Metropolitan Line. Capital Transport. ISBN1-85414-275-5. Green, Oliver (1987). The London Underground: An illustrated history. Ian Allan. ISBN0-7110-1720-4. Bruce, J Graeme (1983). Steam to Silver. A history of London Transport Surface Rolling Stock. Capital Transport. ISBN0-904711-45-5.
Green (2004), introduction. Green, Oliver, ed. (2004). Metro-Land (British Empire Exhibition 1924 reprinted ed.). Southbank Publishing. ISBN1-904915-00-0. Archived from the original on 28 June 2008. Retrieved 22 April 2012.
Green (2004), introduction. Green, Oliver, ed. (2004). Metro-Land (British Empire Exhibition 1924 reprinted ed.). Southbank Publishing. ISBN1-904915-00-0. Archived from the original on 28 June 2008. Retrieved 22 April 2012.
spavalleyrailway.co.uk
"Stock List". Spa Valley Railway. 3 November 2009. (listed under coaches). Archived from the original on 7 April 2014. Retrieved 1 April 2014.