I am not certain, but Amtrak may have at some time in the past displayed some Superliner's at Boston, perhaps for one of those "Family Day's" open houses...Assuming that the platforms in Albany,Syracuse,Schenectady, Rochester and yes even Boston were low level would it be possible to run a Superliner equipped train all the way though to Boston? In other words are the platforms the only major physical impediment. Are there any physical clearance problems on the Albany to Boston portion or in the Boston area? I know that years ago (the 1970s) there might have been some height clearance problems along the route however I understand that the railroads had by and large cleared them up just to make room for the taller automobile and vehicle transport cars,so that they had an additional financial motivation beyond that of being able to handle "dome" cars and Superliners.
I remember that the most notorious rallroad when it came to not allowing dome cars on it's property was the "Bad" Old Southern Pacific which would only allow it's own home built domes and some ex Chessie 3/4's size domes on its routes. By the time the Superliners came around in the late 70's and early 80's that was no longer a problem however. There may have been a similar problem on the Old Boston and Albany branch of the New York Central but if that was ever a problem it was virtually non existent as domes weren't run on the New York Central to begin with.
Does anyone recall?