I will be with two other adults on my Eastern Europe Trip in September/October and I am having a very difficult time finding the best way to travel between Bucharest, Romania and Sarajevo, Bosnia Herzegovina.
We would like to do an overnight train, if possible, but would consider traveling by bus or private transfer.
It is possible to get from Bucharest to Sarajevo on train - likely requiring a rather roundabout route via Budapest, Hungary and Zagreb, Croatia or even Salzburg, Austria an thus easily taking as much as 48h.
A map of the railway lines in Europe may be found on the interrail website and their timetable/trip planner will provide connections and times.
Entering Bucharest and Sarajevo as start and end of your travel may or may not yield the optimum connections - do play around with adding stops in between to see if you can manually figure out a better solution than the one initially suggested by the site.
If you're happy to consider other means of transport (i.e. bus) and/or mixing means of transport, this may become much easier, using the Budapest to Sarajevo bus. See here for a useful site that allows comparisons of means of transport.
