Adriatic posted:Could someone explain why and how crossbuck lights & bars (not track signals) could benefit from a directional detection. I can only seem to focus on the fact that if the space between A&B is occupied, both crossbuck signals should activate. Speed doesn't even really matter; on slow days you wait longer to cross. That is what I've observed on the real rails. I even knew the exact A&B spots for crossings near me; fast or slow they triggered the crossbucks at the same spot every day.
The crossbuck signals should activate while the approaching train is some distance from them, but they should stop as soon as the train has cleared the crossing. The fact that the distances from the crossing for activation vs. stopping are different means that directional detection is needed for this feature.
