The purpose of a varnish is to protect the paint of your model. This is especially true if you are using your models...
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What is a varnish?Read more -
With reference to motors used in models, what is meant by the term worm gear?Read moreA worm gear is a type of gear used in model motors that consists of a screw-like shaft (known as a worm) and a wheel...
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How can I easily create gradient variations for my track?Read moreCreating gradient variations for a model railway track can add realism and interest to a layout. Here are a few ways...
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What is the difference between single and double slip points?Read moreA single slip point has one moveable rail that can direct a train onto one of two possible tracks. The single movable...
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What tools are especially useful at holding model assemblies together whilst adhesives set?Read moreSeveral tools are especially useful for holding model assemblies together while adhesives set:Clamps: Clamps are...
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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