Co-Co

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For British pop group, see Co-Co (band).

For the Hong Kong magazine, see Co-co! Magazine.

For contingent convertibles, see Convertible bond.

A British Rail Class 47 Co-Co locomotive.

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. 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.

There are many examples to be found around the world.