Sources differ: Bruce 1983, p. 11 says that initially the District insisted that it provided the traction over its railway, so District and GWR locomotives were exchanged at Earl's Court, but Peacock 1970, p. 48 says that the GWR provided all the motive power. Both agree that some District carriages were used at the beginning. Bruce, J Graeme (1983). Steam to Silver. A history of London Transport Surface Rolling Stock. Capital Transport. ISBN0-904711-45-5. Peacock, Thomas B. (1970). Great Western London Suburban Services. Oakwood Press. ASINB0006C7PD2.
Peacock 1970, p. 48. Peacock, Thomas B. (1970). Great Western London Suburban Services. Oakwood Press. ASINB0006C7PD2.
Peacock 1970, p. 38. Peacock, Thomas B. (1970). Great Western London Suburban Services. Oakwood Press. ASINB0006C7PD2.
Lee 1956, p. 29. Lee, Charles E. (1956). The Metropolitan District Railway. The Oakwood Press. ASINB0000CJGHS.
Peacock 1970, p. 49. Peacock, Thomas B. (1970). Great Western London Suburban Services. Oakwood Press. ASINB0006C7PD2.
