score:2
At least in Europe, the train operators usually do as follows:
On e.g. suburban lines with frequent departures, there will be extra departures during the extra hour. A train scheduled to depart 2:30 will run both 2:30 CEST and 2:30 CET. (In Europe, the clocks are set back from 3:00 to 2:00.)
Long distance trains will wait for one hour at the first station they reach after 2:00 CEST, so that all departures after 2:00 are following winter time. If they don't wait, all departures after 3:00 would anyway be one hour early.
There may of course be strange exceptions particularly for trains travelling between areas where DST is used and where DST is not used. At least in Europe, AFAIK, all countries using DST switch back and forth at the same date. In other parts of the world, that is not always so and that will of course also lead to confusing situations.
These basic rules sound to me the easiest way to prevent anyone from missing their train, so I would assume that very similar approaches are used elsewhere in the world as well. After all, humans have lived with complicated and cluttered time zones for several hundred years, so even if we are still not willing to simplify everything a lot, we do at least have more than enough experience on how to make things work as smoothly as possible.