Like Coleridge's Kubla Khan, I have the fragment of a dream from which I awoke.
A Super-superliner sleeper,
A Supertrain travelling,
Forty-feet wide, dining car like a ballroom,
Lost in the corridors and passages.
Dormitory rooms the size of tennis courts,
Of this I dreamt and boarded
for destinations far
And then awoke.
Yes, I had a dream that I was boarding what was basically a "SuperTrain", or even wider Amtrak train. The "sleeper" was basically a large dorm with private pods, easily 40' across.
It was articulated so you could walk into the dining car and never know you had changed cars. The dining car itself was like a small, 2 level ballroom.
It was quite an interesting train. I never got to the coach car.