Croatia/ Hrvatska timetables

I have planned most of my trip which starts at the end of June.  I have 3 days open to stay somewhere and was considering Pula, Rijeka or Umag Croatia.  I was wondering if it is possible to use a Eurail pass to go from Bled, Slovenia to either of those 3 destinations or if it is mostly by bus.  Also was wondering if there is any train service from either of those locations to Milan, Italy.  Thank you.