Most employees would recognize Mr. Boardman on sight. It would be near impossible for him to travel incognito on an Amtrak train.
Heck, a few years back I was riding on the Capitol Limited and then Amtrak President Alex Kummant's wife was traveling on the train. Not the President of Amtrak, but his wife. And every employee knew that she was on that train, even though many passengers didn't know.
And just about two years ago I was riding the LSL and Brian Gallagher, Mr. Boardman's right hand man, was on that train. And again, every employee knew it and they were all on the best behavior.