I think it was related to the Antifa admission that they had poured concrete on the tracks to stop trains that were transporting oil from ‘fracking’ fields.
I could be wrong but the Antifa admitted to the sabotage but tried to temper their crime with a defense that they had called the railway workers office to alert them. Someone remarked they forgot to inform Amtrak.
That article was from April and it wasn't these tracks.
Separate incident altogether.