Co-Co locomotives

NZR DFT class Co-Co diesel-electric locomotive 7295 at Dunedin, New Zealand.

Co-Co is a code for a locomotive wheel arrangement with two six-wheeled bogies with all axles powered, with a separate motor per axle. Co+Co is the code for a similar wheel arrangement but with an articulated connection between the bogies. The equivalent UIC classification for this arrangement is Co′Co′. Co-Cos are most suited to freight work as the extra wheels give them good adhesion (traction or friction seems the proper word). They are also popular because the greater number of axles results in a lower axle load to the track.^[1]

Notable examples include the British Rail Class 47, the Soviet M62 locomotive and the EMD Series 66, mainstay of many current European heavy rail haulage fleets, over 500 having been built to date. The very strong IORE locomotive has this also, but to allow higher locomotive weight, 30 tonnes per axle.

See also

• Co+Co
• Bo-Bo
• Category:Co-Co locomotives
• Category:Co+Co locomotives

References

1. ^ Lee, Robert (2007). The Railways of Victoria 1854-2004. Melbourne University Publishing Ltd. p. 212. ISBN 9780522851342. 

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