Baltic Explorer may leave you stranded
Don't get stung by the Belarus visa situation en route from Poland to Lithuania (or onwards to Estonia/Latvia.) A train leaves Warsaw and arrived at the Lithuanian border at Sestokai, where you change trains for the onward trip. A word of warning: If you've got a "Baltic Explorer" railpass, don't rely on getting it validated at Sestokai, because the train arrives/departs well after the station office has closed (if indeed there is one) and the train crews don't have a clue what the pass is (even though it is explained in all three of the Baltic languages). This can work in your favour, however - I was let on board, given a private coupe (unpaid for) and arrived in Tallinn without having got the pass validated, which gave me a few extra days free! Even then, I had to physically mime stamping the pass for the ticket clerk to understand what on earth it was.
