aggiedad wrote:
I am a retired Amtrak employee. The windows are certainly not optical glass. On cross country trips I made, I tried opening the windows in vestibule doors to get some shots, however onboard folks made short work of that endeavor due to safety rules.
I found my efforts were not really satisfactory, similar to shooting out of tour bus windows. That being said, the most enjoyable part of my trips was visiting with the variety of other passengers.
I guess the best you can do is place the front of the lens right up against the window and hope for the best. Fast shutter speed of course, to cancel out the vibration effect. If the window is not clear it will reduce the contrast of the shot, but that's easy to correct in post. It can also decrease sharpness.