The only person arrested was trying to stop the destruction (got tazed as well for his efforts and pinned down by half a dozen cops).
The Government didn't do anything when trains were blockaded (despite laws on the books) either. Watch them spurge out now over Ottawa.
https://montreal.ctvnews.ca/protestors-block-railway-near-montreal-in-solidarity-with-wet-suwet-en-hereditary-chiefs-1.5693711