In modelling, scatter is a general term used to describe any scenic material that is fine enough to be sprinkled onto...
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What is scatter material?Read more -
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...
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What is the difference between a diorama and a cameo?Read moreDiorama derives from the greek dia (which means through) and horama (which means view).Diorama is one of those...
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What is the difference between a single action and double action airbrush ?Read moreWhen it comes to airbrushing, there are two main types of airbrushes : single action and double action. These terms...
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How can I best create wet road surfaces and pavements on my layout to simulate a rainy day?Read moreSimulating seasonal variations is a common theme for many modellers who wish to model specific times of the year,...
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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