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. [cite book |author=Oberg, Leon |title=Locomotives of Australia 1854-2007 |date=2007 |publisher=Rosenberg Publishing |isbn=1877058548 |pages=p.250] The convert|1500|hp|kW|abbr=on|lk=on A1A-A1A Clyde/EMD ML1 locomotive was introduced on 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 convert|1800|hp|kW|abbr=on|lk=on 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. [cite web| url=http://locopage.railpage.org.au/sra/421.html |title=SRA: 421 Class |date=2007-09-05 |accessdate=2008-06-07] 1970 saw the introduction of the last new locomotive design in the world to utilise the F-series bulldog nose, the convert|3000|hp|kW|abbr=on|lk=on EMD AT26C, introduced on Commonwealth Railways as the CL class. [Oberg, p.360] [cite web| url=http://locopage.railpage.org.au/anr/cl.html |title=AN: CL Class: |date=2007-09-05 |accessdate=2008-06-07] 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.

The NOHAB bulldog

There were also a number of European "bulldog nose" locomotive classes, all of which were built by NOHAB or AFB (with license from EMD), also frequently referred to as "round noses". These were effectively Clyde's ML2 design modified to meet European clearance standards, and had a lower nose and deeper cab windows. [cite web |url=http://www.nohab-gm.com/en/en05_1.html |date=2006-01-10 |title=NOHAB-GM Foundation - Worldwide Historic Overview |accessdate=2008-06-07 ]

The NOHAB-built classes include the DSB's class MY/MV and MX, the NSB's class Di3 and the MÁV class M61; NOHAB's design was later used by AFB, which built the NMBS/SNCB's class 52-54 and the CFL's class 1600.

References

External links

* [http://membrane.com/bigtoys/rail/units/e_units.html Andrew Toppan's list of surviving EMD E-units]
* [http://www.gbg.bonet.se/s-type/ Gallery of NOHAB-GM diesel locomotives] by P. Matsson
* [http://www.diesellok.lu/ Diesel locomotives built by NOHAB and AFB] by Armand Schmit
* [http://www.roundnoses.com/ Wouter's Train Page] by Wouter Radstake — pictures of both American and European "bulldog noses"