You need to look at the following link. Freeze it where you can look at the PRR CAT. There is a support cable going from a vertical pole on one side of tracks to another pole on other side of all tracks. Then note that all 4 tracks have their CAT contact wires connected to this support wire. Also, other cross wires with insulators installed. Therefore, any snag on one wire may but not always pull all 4 track's CAT down.I'd be surprised if the wire came down on all four tracks. When the wire was first created it was wound on a spool. After the wire is installed as catenary, if it breaks it wants to curl up again, but not so neatly. It then fouls any adjacent tracks.
jb