That's definitely an Amfleet not a Superliner. The windows! I don't see a calf-rest, just a foot rest which would make it an Amfleet-I Business Class car that I believe (I've never ridden it) is that class on the Palmetto that also operates with a mixture of high-density Amfleet-I cars (less legroom than this) and lower density (more legroom and calf rests) Amfleet II cars for Coach Class.