A Railroad Crossing (RRC) in WME will yield a visual alert in the app, that might be combined by a sound alert depending on the placement. It should be added to every intersection between a railroad and a drivable segment. This also includes placement on AGCs (At-Grade Connector) that cross the railroad at a point relatively far away from the main road.
Important: the location of the railroad crossing in the app is set by the RRC icon itself. The red dot is only a handle used for alignment. Therefore, make all functional decisions based on the RRC icon, not on the red dot.