Mainline Railways was a British model railway brand that operated between 1976 and 1983, introduced by Palitoy, the...
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What was the Mainline Railways company?Read more -
What is a Wickham Trolley?Read moreA Wickham Trolley is a small railway maintenance vehicle once widely used across Britain's railways. Built by D...
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What was the Bachmann 'Blue Riband' subbrand ?Read moreThe Blue Riband subbrand was a significant step in the evolution of Bachmann Branchline, the UK division of Bachmann...
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Do I need to apply a camber to a tight curve of track on my layout?Read moreApplying a camber to a tight curve of track on your model railway layout can help improve the realism and operation...
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Avoiding the "Toy Train Look": Realistic Track ArrangementsRead moreA well-designed model railway is more than just a collection of tracks and trains: it’s a miniature world that...
In railways, what are two, three and four-aspect signals?
We often hear about colour light signals having two, three or four aspects in their description, but what does this mean?
In this case, there is no complicated explanation as it simply refers to the number of lights (or combinations of) that a signal is capable of showing.
A two-aspect signal in model form, for example, will be able to show two lights. This could be a red and green, a red and yellow or a yellow and green. A three-aspect signal will show a red, green or yellow light and a four-aspect signal will be able to show a red light, a green light, a yellow light or a double yellow light just like the prototype (the double yellow is counted as just one aspect in the description because it reuses the first single yellow light).
Generally, if a model signal has a route indicator or shunt signal attached, it is not counted as a separate aspect, and the product will list these separately.
Posted in: Model Railway
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