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Per Burlington Northern General Signal Instructions, Dwarf signals display the same aspects and indications as high signals.
Signal aspects can be referenced in the 1991 timetable here:-
Timetable 1991. Note that the double head searchlight with Lunar is the only mast able to display all of the aspects. Not all of the possible masts have been defined but there is a varied selection here that should cover most requirements. Due to the nature of this being a simplified prototype system it is not easy to display all the possible variations of the same aspect on a mast and this should not be necessary. Where a mast can display different variations of an aspect (e.g. Diverging Clear) where possible the Restricted Proceed aspect is shown for the alternative diverging route.
See the Aspects page.
Signal Mast definitions:
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