Yes! Three occasions.
NS at MG tower I was clearly in the wrong, trespassing, and when NS Police asked me to leave… I (we) left.
In 2003 I rode the Amtrak California Zephyr from Chicago to Sacramento. Stepped off my car in Denver with a camera and within minutes two city police told me to put the camera away or it would be confiscated.
But you don’t understand, I told them. I’m a ticket holder, a tourist, just stepped off the train to take a few snapshots. They stepped in closer. Their body language was telling me to back off. I said, look at all those people up there, (I was outside the Sightseer Lounge) they have cameras and they ARE taking pictures!
We don’t care about them, we are telling YOU to put away your camera or lose it!
Haven’t been back to Denver since! I showed them!
Another time was a similar situation at Washington Union Station. Amtrak Police. I was travelling as an escort, or rider, on two private cars moving from Charlotte to Cincinnati and had a one day layover in D. C.
Again, standing on the platform next to the cars I was video taping comings and goings near tower K when an Amtrak peace officer approached me and told me to stop taking pictures. “These are post 911 rules” I didn’t see a sign saying photography is prohibited, I countered. We don’t have to put up any signs, was the reply.
I had to go through the whole photo ID check, she came on the cars and looked through the transportation papers (to be sure we didn’t sneak two 85 foot Pullmans in there overnight) and I had to call the car owner to verify that I was indeed the caretaker of these cars.
Again I asked “what would happen if I were to take pictures out the end door or through the windows?” Oh, I can’t stop you from doing that, she replied.
I read in the press that a little more leniency has been extended by Amtrak recently but for me it has taken all the fun away.