Craig’s clarification is one that is often overlooked, even in games on this site.
The important things that I want to emphasize about TRN’s…
1. They can carry UP TO 1 INF and any 1 other land unit. But they can carry only 1 unit of any land type (this comes up often from new folks thinking they HAVE to have an INF and something else in order to use a TRN).
2. Once a TRN offloads it is DONE for the turn.
3. Forget the term “bridge”. It is just a regular load and offload, with a movement of zero spaces for the TRN.