This past week as my brother rode the train into New York from New Jersey, he noticed a man, who looked to be of Middle Eastern descent, taking pictures of the train's interior and platforms, and making notes.  He kept on eye on the man and quietly notified the conductor.  No one else had seemed to notice.  The conductor advised the man that photography is not allowed onboard the train and continued to observe him from the rear of the car.  The man ignored this notice and kept on with his picture and note taking.  At the next stop, plainclothes detectives pulled the man off the train.
 
Vigilance or paranoia?
 
We'll never know.