Vegetation.

Vegetation on railroad property which is on or immediately adjacent to roadbed shall be controlled so that it does not— (a) Become a fire hazard to track-carrying structures; (b) Obstruct visibility of railroad signs and signals along the right-of-way; (c) Interfere with railroad employees performing normal trackside duties; (d) Prevent proper functioning of signal and communication lines; or (e) Prevent railroad employees from visually inspecting moving equipment from their normal duty stations.