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Following on from the successful introduction of working semaphore signals in N gauge Dapol are expanding their range to include colour light signals.
3 aspect signals are the usual base signal for MAS (multiple aspect signal) schemes. Unlike the semaphore and 2 aspect signal which are either stop or warning signals the 3 aspect head combines these functions, allowing all signals to be stop signals and to act as the distant caution signal for the next signal. Drivers can rely on the 3 aspect signals to warn them when they are approaching a stop signal, while the stop indication can be cleared to caution as the train ahead moves beyond the next signal. Thus more trains can be passed through the system!
3 aspect signals are normally positioned about 1 mile apart to allow sufficient distance for a train to brake safely and without causing discomfort to passengers.