This week Metro returns to automatic train control on the Red Line. Sounds insignificant — but it isn’t. Since the accident in June, 2009, that killed nine people, Metro conductors have used individual controls for stopping and starting. And stopping and starting. And stopping and starting.

Which means that some operators hit the right point on the platform first time around, and others — uh, do not.

Which means that some passengers keep on reading the paper, using their phones, playing Sudoku, while others — the ones with weaker stomachs — sit very still and hope for fresh air soon.

The automatic train control promises a less herky-jerky traveling experience. Legato not staccato. But this will be available only on the Red Line (which shares no tracks) until 2017, when the Orange, Silver, Blue, Yellow and Green Lines follow suit.

I ride the Orange Line for a dozen stops, the Red Line for two. I can’t wait for my short, smooth ride.