I don't know why I didn't get around to responding here, but I like your interpretation a lot.
For me it was always a kind of reminder that things are always changing, train doors gotta close to get to the next stop, with or without us.
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Thank you for circling back after all this time. I actually think of this poem often. I can't say I always remember the whole thing, but I remember the part I quoted. It makes me consider whatever is going on in a different light.