That makes a grand total of zero sense. So sorry Cappi. I feel this may be my fate as well. I have had family and friends who work on RR and have all stated that corruption/greed/entitlement run rampant and that the people in charge haven't a clue. Somehow, you were probably screwed over for a random reason. There are positions open as of the other day for Station cleaner, engineer, and track worker. Check em out and apply. My boy on the RR tells me if you don't make the cut to harass HR that you'll take any position and sometimes it works. You can always reach out to HR on this but at this point probably wouldn't get a response. Sorry again man!
When did you get the letter?
Also, I had the exact same experience by getting to interviewer, who seemed to like me, and said same thing that she was recommending me to move on to next step amd watch for an email.