Question: what is the difference between business class and first class on acela?
Answer: The first class car was the last car on the train. Seats are basically the same as in Acela Express business class. They're a bit wider, a bit more legroom, but they're similar. The benefit I think is that there are solo seats (seating 1-2 rather than 2-2) so you can have more personal space if you're traveling alone.