On Chinese bullet trains the seats always face forward, but the train shuttles to-and-fro. How?

I observed that on Chinese bullet trains the seats always face in the direction of the travel (forward). But the train must go back and forth between

I observed that on Chinese bullet trains the seats always face in the direction of the travel (forward). But the train must go back and forth between stations, so it must travel in BOTH directions. Do they rotate the entire train? Or they rotate the seats?

or:I observed that on Chinese bullet trains the seats always face in the direction of the travel (forward). But the train must go back and forth between stations, so it must travel in BOTH directions. Do they rotate the entire train? Or they rotate the seats?

or:rotate the entire train.

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