Inevitably in most modelling projects, there is a requirement for the clean-up of parts prior to assembly. This may...
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What are the benefits of a multiple grit sanding stick?Read more -
What is a roundhouse?Read moreA roundhouse refers to a specialised building, typically found in larger rail depots, designed for housing and...
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What is BR sectorisation?Read more"BR sectorisation" refers to the reorganisation period starting in 1982 when British Rail restructured its operations...
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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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My rails have been damaged, how can I straighten them?Read moreFortunately, incidents where track gets damaged after installation are relatively rare, but spare track, and track...
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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