Yes, the Quest is also asked on level crossing with electrified railway - due to overhang power lines there might (or might not) be a sign indicating max height allowable.  If it is not signed in this case, please answer "Uh..." / "There is no sign..."

(as this quest works the same in SCEE and upstream StreetComplete, if quest is unclear or confusing, please report it at https://github.com/streetcomplete/StreetComplete/issues/ - thanks!)