Flanger signs or snow plow markers were often used to warn plow crews lift the flanger between the rails or raise the side wings because of an upcoming obstruction which could be obscured under snow. Obvious obstructions would be road crossings, guard rails, turnouts and crossings; what are example of other things which would need protection?
Were they usually left in place year-round, or were they re-installed each season? You'd think that they'd stay in place (there doesn't seem to be any harm to the railroad to keep them in place), but this source calls them "temporary"By requiring them to be reinstalled every season, was that a way to make sure that any new obstructions along the right-of-way (which would clear passing trains, but not an extended plow blade) weren't missed?
I see that Creative Model Associates offers HO flanger warning signsDoes anyone know what shape their flanger signs are?
____ Mark Mathu The Green Bay Route: