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What is a laser-cut kit?Read more -
What is the purpose of the leading wheels on a steam locomotive?Read moreLeading wheels, also known as pilot wheels or guide wheels, serve an important purpose on a steam locomotive. They...
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What is meant by 'Bringing life to your layout or scene'?Read moreOften, railway modellers talk about the importance of bringing their scene to life, but what does this mean? and why...
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What is the best way for beginners to power a model railway?Read moreIf you have never built a model railway before then it may not be obvious how to supply your model railway tracks...
What is a Co-Co wheel arrangement?
There are many variations of wheel arrangements for diesel and electric locomotives just as there were with steam locos, and for the same reasons: to facilitate different power outputs and distribute the weight of an engine. These arrangements have been allocated codes to make them easily identifiable.
Co-Co refers to a locomotive with a single bogie attached to each end, each bogie has 6 wheels attached to it (3 on the left side and 3 on the right). This means that the locomotive has 12 wheels in total. On a Co-Co locomotive, each wheel has its own traction motor resulting in all of the wheels being powered.
Locomotives with a Co-Co wheel arrangement are very good at hauling thanks to their all-wheel drive and often have a favourable route availability due to the weight of the locomotive being distributed through 12 wheels. The latter is the reason why more diesel locomotives have Co-Co wheel arrangements than electrics as these tend to be much lighter, therefore, negating the need to distribute their weight.
There have been a few classes of locomotive that due to their immense weight have needed their weight distributing beyond the capabilities of a Co-Co bogie. This was done by adding an additional two-wheeled, unpowered bogie to each end of the locomotive. This new configuration was given the code 1 Co-Co 1. Locomotives that adopted this configuration include the British Class 40 and Peak classes 44, 45 and 46.
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