My corporate travel fares for Acela are usually around $100 (ranges I've seen are $98-$134 in general recently...for this particular trip, I could have booked at $98 for Acela for the NYP-WAS route).
I can only book through our corporate travel site (Cliqbook) - not on Amtrak.com, but can pay with a personal card for personal travel. I think Amtrak corporate rates are only available through travel agencies at this time.