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. Snippet view at google.com, retrieved 20 August 2012 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.
Lee 1956, p. 9. Lee, Charles E. (1956). The Metropolitan District Railway. The Oakwood Press. ASINB0000CJGHS.
Lee 1956, p. 27. Lee, Charles E. (1956). The Metropolitan District Railway. The Oakwood Press. ASINB0000CJGHS.
Lee 1956, 3rd plate in centre of book. Lee, Charles E. (1956). The Metropolitan District Railway. The Oakwood Press. ASINB0000CJGHS.
Lee 1956, p. 35. Lee, Charles E. (1956). The Metropolitan District Railway. The Oakwood Press. ASINB0000CJGHS.
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. Snippet view at google.com, retrieved 20 August 2012 Lee, Charles E. (1956). The Metropolitan District Railway. The Oakwood Press. ASINB0000CJGHS.
Jackson 1986, pp. 54–57. Jackson, Alan (1986). London's Metropolitan Railway. David & Charles. ISBN0-7153-8839-8. Snippet view at google.com, retrieved 20 August 2012
Jackson 1986, pp. 104–109. Jackson, Alan (1986). London's Metropolitan Railway. David & Charles. ISBN0-7153-8839-8. Snippet view at google.com, retrieved 20 August 2012
Jackson 1986, pp. 110–112. Jackson, Alan (1986). London's Metropolitan Railway. David & Charles. ISBN0-7153-8839-8. Snippet view at google.com, retrieved 20 August 2012
Jackson 1986, pp. 158–160. Jackson, Alan (1986). London's Metropolitan Railway. David & Charles. ISBN0-7153-8839-8. Snippet view at google.com, retrieved 20 August 2012
Jackson 1986, pp. 119–120. Jackson, Alan (1986). London's Metropolitan Railway. David & Charles. ISBN0-7153-8839-8. Snippet view at google.com, retrieved 20 August 2012
Jackson 1986, pp. 344–345. Jackson, Alan (1986). London's Metropolitan Railway. David & Charles. ISBN0-7153-8839-8. Snippet view at google.com, retrieved 20 August 2012