Ah, apparently it asks for a height limit because the track is electrified. I misunderstood the reason for asking, so I assumed there would be a mistagging: https://github.com/streetcomplete/StreetComplete/blob/3b074e1d077aad25071e9773f6471b2490077869/app/src/main/java/de/westnordost/streetcomplete/quests/max_height/AddMaxHeight.kt#L96-L102.