Article Details
- Title
- Aspect
- ParentTitle
- Routes
- Sequence
- 0
- Body
- The Aspect section provides a way to specify the aspect of the signal. It can be conditional, such as that required for [b]approach control[/b]. Aspect sequencing logic can be simplified by specifying the aspect sequence rules in a [b]Signal Set[/b]. Where aspect sequence rules are used, and there are no conditions on the signal showing proceed beyond Ascon and other data, the data takes the form: S123.seq(S456) where S123 is the signal whose aspect should be driven, and which should match the entry [b]Signal[/b] of this [b]Route[/b], and S456 is signal whose aspect should be used to determine S123's aspect. For example, in UK signalling, if S456 were to display double yellow then S123 would be displaying single yellow (Advance Approach and Approach aspects in various North American rule books). If the aspect to be shown cannot be determined by [b]Signal Set[/b] rules alone, then conditional statements can be used instead to specify an aspect to be shown. Example: if TABC.c then S123.aspect(Green) else S123.aspect(Yellow) fi which indicates that the signal should show a Yellow aspect but may step up to a Green if TABC becomes occupied.
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- 2
- Created
- 30/07/2025 at 02:52
- Updated
- Never
- Created By
- CajonRail
- Updated By