The closest train station to Bloomsburg (I assume this is the Bloomsburg near Reading, PA?) is Lancaster and there is service from Penn Station-NYC to Lancaster through Philadelphia. Check Amtrak on-line for schedule and fares. Greyhound bus service only has one morning bus from Port Authority Bus Terminal-NYC to Allentown, PA, nothing to Reading or Lancaster or later in the day. Looks like the train to Lancaster is the best bet. You can get to Penn Station from JFK by NYAS express bus from terminals ($15) or Airtrain from terminals to Jamaica Station and either E subway or LIRR to Penn Station.
The closest train station to