I didn't even think about what would happen when the rail was shut down for investigation.  And the terrorism aspect of it all.  What happens if people are too scared to ride it because crime or a terroristic attack or threatening.  Bomb threats will also shut down the rail. Or imagine a package left on the rail that is ticking or that releases a chemical or a powder. Sure it might be a package with drugs because of the all drugs that will be trafficked around the island with the rail, but you can't tell what it is and the rail would need to be shut down to figure it out or contain the chemical. 
Thank you for your post.  I enjoy engaging in intelligent discussion on this site.