Jasidih Junction is the busiest railway station in Jharkhand by train frequency, with far more long-distance connections than Deoghar's own station - many trains from Kolkata, Delhi, Patna and beyond stop here first, making it the practical gateway for most pilgrims travelling by rail.
About 6-7 km. Auto-rickshaws and taxis are readily available right outside Jasidih Junction for the short ride to Deoghar and the temple.
Yes, there's a dedicated Jasidih-Baidyanathdham branch line, in addition to regular road transport - Jasidih Junction has 5 platforms and 9 tracks, handling a high volume of daily trains.
Many pilgrims prefer staying in Deoghar itself, closer to the temple, but Jasidih is a practical option if you're arriving late at night or departing early morning by train, since it saves the extra travel time to and from the station.
The station has auto stands, bus stands, and parking available, making onward travel straightforward whichever direction you're headed.