The interior of Amfleet Is are indeed a tad bit dark and reminiscent of an airliner. Maybe that approach worked when America was excited about air travel, but nowadays, we are all scrambling to find anything but. The worst way to attract customers to come back after their first train trip is to make them immediately say, "Hey, it looks like an airplane!" NO!! That's exactly what people want to get away from! We don't want an airliner on rails that goes 1/10 the speed (on a good day). A big perk for riding trains is the bigger windows... which Amcans seriously lack.
Amfleet IIs on the other hand, present themselves a little better in my eyes (as coaches, not lounges). IMHO, they look damn fine (when they're clean) bringing up the rear of the Silvers every day. The corrugated steel and modern shape give them a classic railroad look that doesn't quite look outdated. The new refurbished handicapped bathrooms allow for ample space and the overall look of the interior does indeed present a very cozy feel that promotes relaxation. Though I loved my ride on the Acela, its bright and overly spacious interior was something that not many people would feel comfortable in for anything other than daytime travel.