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Tangentially related: The seats on Shinkansen trains can be rotated to adapt to the needs of the passengers.

• dredmorbius 2y ago
  Many US commuter-rail trains also have reversible seats. The train crew generally orient these to be forward-facing for the direction of travel, possibly excepting the first seat in a car. (The trainsets reverse directions without being turned around themselves. Those using locomotives rather than electric traction operate in "pusher" mode for half their trips. There's an operator cab in the end car for such trips.)
• Tor3 2y ago
  They can be rotated, but that's supposed to be done by train personnel when changing directions. That's the primary purpose. The only time you're allowed to rotate them yourselves is when you're e.g. a group of four - then you can have two sets of seats face each other.