Army Painter Quickshade is a special wash-like paint solution that will add shadows to models and miniatures quickly...
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What is Army Painter Quickshade?Read more -
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What is a reed switch?Read moreYou can use reed switches on your model railway when you want an action to be triggered by a train passing over a...
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What is the difference between bullhead and flat-bottom rail?Read moreFrom a modeller's perspective, there is no practical difference between bullhead and flat-bottom rail. The existence...
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What are flatbed wagons used for?Read moreFlatbed wagons, often referred to as flat wagons or flatcars, are railway freight vehicles designed with a flat, open...
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Which glue should I use?Read moreThis is really dependent on what it is you plan to glue. There are several different glues for different materials....
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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