This is a picture I did not take
of the Skyliner train that runs between Narita airport and Ueno Station in Tokyo. The train has two streamlined fronts; it travels back and forth, without a turnaround.
All of the seats face one direction. Instead of building more track (with a complicated turnaround) in downtown Tokyo, the train was constructed so that the seats robotically swivel after dispatching their passengers, and in doing so, prepare themselves for the next batch of passengers heading the opposite direction.
But you can't swivel all the seats on a train at the same time, there wouldn't be enough room. The engineers devised a system where every other row (the odd rows) turn together, and then a few seconds later, the evens turn, creating an about-face makeover for a bi-directional train. Amazing. And for me, unphotographable.