Harry Jack, Locomotives of the LNWR Southern Division : London & Birmingham Railway, London & North Western Railway and Wolverton Locomotive Works, Sawtry, Railway and Travel Correspondence Society, (ISBN0901115894, OCLC50330788), =36.
Colin G. Maggs, The Birmingham to Gloucester Line, Stroud, Amberley, (réimpr. 2e, 2013) (ISBN9781445606996, OCLC855200150), p. 102.