Ordinarily, if you book sleeper accomidations in advance, the cost of your rail fair is reduced to the lowst available bucket for that trip.


However, what happens if you've already paid for your ticket at let's say $100 for a one way fair. Let's assume $100 is the highest bucket and $25 is the lowest bucket.

If you upgrade to a sleeper while on board, are you credited any difference in rail fair or a prorated difference if the upgrade occurs in the middle of your trip?

How does the crediting work since you've already paid for your initial coach ticket at the higher cost?