[desigooner]

I don't recollect being asked for my ID while riding Amtrak on the Northeast Corridor in the last 2 years. I don't even print the stubs anymore - I just use the Amtrak app / Passbook on my phone to display my ticket.

[tcas]

Same here -- I take the NEC every month or so and have never been asked for my ID in around 3 years.

I was once asked for my AAA card when using that discount on the regional, but even that is extremely rare.

[mixmastamyk]

It's not asked on the train, it's asked when you buy the ticket at the window. If you use your CC, they then have id info presumably.