a VirtualTourist member from Istanbul
We heard that it takes 2 hours between dubrovnik and ploce. How are we going to catch 6:20 ploce to doboj train..because we checked the bus shedule of dubrovnik the earliest bus is at 5:00 o'clock in the morning.
If I were you I would forget about trains and Ploce and simply use the bus to Sarajevo. If you have some kind of a rail card then in order to save a bit you can use a bus to Mostar. From Sarajevo (and probably from Mostar too) it should be fairly easy to reach Doboj by either bus or train.