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Bulldog nose
"Bulldog nose" is the nickname given, due to their appearance, to several diesel locomotives manufactured by GM-EMD and its licencees from 1939 to 1970. The term originated with EMD F-units, as well as later E-unit models such as the E7, E8, and E9.
==Clyde derivatives==
In 1951 the EMD F7 series was modified by General Motors' Australian licence holder Clyde Engineering to fit Australian loading gauge and axle load constraints. The A1A-A1A Clyde/EMD ML1 locomotive was introduced on the Commonwealth Railways as the GM class, as well as exported to Pakistan.〔Oberg, p. 251〕 It was further developed into the ML2 as a dual cab Co-Co locomotive, with a bulldog nose at each end, for Victorian Railways becoming that system's B class.〔Oberg, p.264〕 A single-nose variant of the design, the EMD A7, with the revised EMD 567C series engine was introduced as the NSWGR 42 class, VR S class, and an upgraded CR GM class. The design continued to be developed with the dual-cab EMD AJ16C, introduced on NSWGR as the 421 class, although unlike the earlier ML2 the bulldog nose was only used on one end of these locomotives.〔(【引用サイトリンク】title=SRA: 421 Class )〕 1970 saw the introduction of the last new locomotive design in the world to utilise the F-series bulldog nose, the EMD AT26C, introduced on the Commonwealth Railways as the CL class.〔Oberg, p.360〕〔(【引用サイトリンク】title=AN: CL Class: )〕 A final Australian iteration of the bulldog nose in Australian locomotive practice was the rebuild of the 30-year-old Victorian ML2 units into the EMD AAT22C-2R, introduced as the V/Line A class.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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