245 ROL is about 50/60€ so that means the normal full fare.
It has been told here by now so many times: for RES only this is only possible if you, a person, visits the desk/counter of another person working for the state raiwlays CFR (tsjeh-feh-reh) In the Romania-in major stations, and I assume Videle (how the heck did you get there anyway? or family?) is not among them. The usual report says there is always plenty of space, but this seems to attract: I read a note in quite another forum of train-lovers a few days ago that told it was full 1 day, yes heaps of passholders and some UKR refugees.
The ´train´ BUC-IST does not exist as such-only summertime (final date unknown till now) is 1 couchette car among cars with other ends and shunted 2-3 times on the way to join the ´main´ train (usually 2-3 cars) from Sofia to Ist-ending Halkali in the early morning, where you then have to arrange a SmartCard to travel further. The surcharge with pass is 14/15€ extra.
As it is the one and only railline überhaupt from BG to IST and this is the one+only train-there is thus very little other choice if you insist on going over rails. In the past there used to be dozens of much faster and cheaper buses, easy to get, often coming from even further north, but this has also dried up a lot.
The possible slightly ALT way is the newer raillink to BG from RO; via the bridge near Vidin, sideline from the car-factory town Craiova-in the end you then reach Sofia, capital of Bulgaria, where you will have a little more seats/beds, but the basic ´problem´-you eternal worry, will not be solved other as waiting till there. Those were once the real joys of riding with a pass-but todays youth seems to have completely lost that perspective.
245 ROL is about 50/60€ so that means the normal full fare.
It has been told here by now so many times: for RES only this is only possible if you, a person, visits the desk/counter of another person working for the state raiwlays CFR (tsjeh-feh-reh) In the Romania-in major stations
DB can also book a reservation for this train at a ticket office or by phone.
The ´train´ BUC-IST does not exist as such-only summertime (final date unknown till now)
I've told you before that the timetable has been known right from the start:
https://www.bdz.bg/en/a/sofia-istanbul-sofia
This year, the Bucharest-Halkali coach leaves Bucharest for the last time on 3 October. Please take note.