Thanks for the news post. Good article. This really doesn't come as a suprise to me. I make the assumption that terrorists consider most transportation avenues a possible target. the more people involved, the more "juicy" the target may seem. Landmarks, other areas where large numbers of people congregate etc. My reasoning is that if I can conceive of it, the average terrorist is or has considered it as well.
I'm not making that statement out of some fear based paranoia, just general knowledge and assumption. The risks to the average person is still extremely low with regards to many of these things.
What really suprised me was that some people considered the use of passenger airliners as weapons a huge suprise a few years ago.
