Heh, heh. Great picture.
Thanks for posting. That was the last American three-engined commercial plane until the, I believe, Boeing 727 came along.
Evergreen Airlines in McMinnville, Oregon, has one restored to it's original, elegant passenger configuration. It is mildly spectacular.
I wandered through it at a show one time, contacted a person I knew who had access, and wangled my way onto a passenger list for a one-way hop to another show. Had to miss because of work, and, alas, the time had passed, and I didn't have the juice to finagle another.
Oh, well.
Arf