(en) « The Webb Compound Locomotives », the Engineer, , p. 655-656 (lire en ligne [archive]).
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(en) « Webb 2-2-2-0 Experiment », sur No. 300 'COMPOUND' Unlined grey. Posed for the camera with the background painted out. LNWR crest on splasher. In early condition with drop down smokebox door and return crank on rear driving wheel. 1883 (consulté le )