Extra tall fences (seen on the overpass in the background) often protect electrified lines from road debris.
Michael S. Murray
Q I have driven over the Northeast Corridor and have seen guardrails on the bridge get higher over the tracks themselves. Why is that? – Dan Wescott, Louisburg, N.C.
A The primary reason higher barriers are installed over the Northeast Corridor and other electrified tracks is to prevent objects from falling on the catenary at that location. A short circuit or broken wires could result, and there is also danger of electrocution to anyone dropping something that conducts electricity. A side benefit is additional protection afforded vehicles and pedestrians if the catenary should snap, but instances of this happening are rare. Higher barriers are also used in third-rail territory. – Bob Johnston
