Using a back-to-back gauge for your model railway ensures that the wheels on your rolling stock are spaced correctly...
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How do I use a back to back gauge?Read more -
What is a poly-cap?Read moreA poly-cap is a type of plastic cap often used in model-making kits, especially for assembling figurines or model...
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What is Graham Farish?Read moreGraham Farish is a name you’re likely to come across if you're interested in British model railways, especially in...
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When did semaphore signals stop being used in the UK?Read moreSemaphore signals, those distinctive mechanical arms that once graced railway lines across the UK, were largely...
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What is Kato track?Read moreKato track is a popular choice in the world of model railways, known for its quality, ease of use and versatility. If...
What is a 1Co Co1 wheel arrangement?
A 1Co-Co1 wheel arrangement is essentially a Co-Co wheel arrangement with an unpowered, articulated pony truck attached to it. This extended bogie design is used to better distribute weight on larger locomotives.
A standard Co-Co wheel arrangement is a way of describing a type of locomotive bogie that has six wheels attached (three on each side) and where each wheel is powered by its own traction motor. A locomotive with a Co-Co wheel arrangement will have two such bogies (one at either end) giving the locomotive 12 wheels in total.
A 1Co-Co1 wheel arrangement is the same as a Co-Co arrangement, but with the addition of two extra wheels attached. These two extra wheels are unpowered so don't have traction motors and sit in an independent bogie (known as a pony truck). The pony truck is permanently attached to the main bogie but is articulated to assist with bends. This means that a 1Co-Co1 bogie has eight wheels in total (four on either side) and likewise the host locomotive will have a bogie at each end giving it 16 wheels in total.
In Britain, 1Co-Co1 wheels arrangements were used on some early designs of diesel-electric locomotives such as the Peak classes (44, 45 and 46) and the Class 40 making these heavy locomotives more suitable for the routes they were intended for.
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