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.