A couple weeks ago on the CL some Feds (not DOA, the DEA) boarded in ALC. They were plain-clothes. They were talking to the C while the AC boarded us.
Right outside PGH they went through the coaches and woke everybody up asking for IDs and ticket stubs. When I asked who they were, they would not answer. When I asked to see a badge he simply flashed it, at four-thirty on a dark train... after it became clear I wasn't going to comply he introduced himself in a proper manner.
See this post holds more water for me... A- its an actual board member posting, and B- the facts are stated in a clear non-exagerated manner.
This seems a bit more intense than what I saw on the LSL. But of course.. what were they looking for? Would you rather have a flashlight shined in your eye or the train blow up when it gets to WAS. I know thats most likely not what they were looking for but either way... the CL does go through some big cities, anything is possible.
The bottom line, being questioned like that seems crazy.