The TR DL class, later known as the EAR 23 class, was a class of 1,000 mm (3 ft 3+3⁄8 in) gauge 4-8-0steam locomotives derived from the . The six members of the DL/23 class were built by Beyer, Peacock & Co. in Gorton, Manchester, England, for the Tanganyika Railway (TR). They entered service on the TR in 1923, and were later operated by the TR's successor, the East African Railways (EAR).[2]
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Patience, Kevin (1976). Steam in East Africa: a pictorial history of the railways in East Africa, 1893-1976. Nairobi: Heinemann Educational Books (E.A.) Ltd. OCLC3781370.
Ramaer, Roel (1974). Steam Locomotives of the East African Railways. David & Charles Locomotive Studies. Newton Abbot, Devon, UK; North Pomfret, Vt, USA: David & Charles. ISBN0715364375.
Ramaer, Roel (2009). Gari la Moshi: Steam Locomotives of the East African Railways. Malmö, Sweden: Stenvalls. ISBN9789172661721.
Staff writer (August 1957). "The "23" Class Locomotives"(PDF). East African Railways and Harbours Magazine. East African Railways and Harbours. 3 (4): 128. Retrieved 9 December 2014.