Ferries and busses in The Baltics
Coming down from Finland, through Estonia and Latvia, I added a couple ferries and an intercity bus to my modes of transport that already included fast trains and slow trains (and really slow trains), rental cars, and planes. I even had one trip where the whole train went on a ferry (Italy mainland to Sicily).
In trying to stay on a budget that allows this travel, I have gotten creative and stayed flexible.
I guess the only thing left is to try a sleeper train sometime. I will keep an eye out for that opportunity in the future.