Yes, at least you got credited...unlike my photos which people just post when they want. The credit would have had more impact though had they not edited your original. That's pretty low if you ask me.
With that said...at least they not only credited you, but the link takes the reader to your actual photo on Flickr so they can see the original rather than have no link included or one that takes the reader only to your main page where they would have to search your entire photostream to find the image.
Read the article. You should send them a letter saying that you will call off your lawyers if they name one of the subway stations "Bob" in your honor.
It looks like they have a pretty good budget, so it may be worth a shot to send them an invoice. Get the image registered if you haven't already.