An important note about this train. It is frequently fully booked on the day and sometimes a few days before. The clerk at the international desk told us it was full on Friday Saturday and Sunday this weekend. Unfortunately it can’t be booked outside of Bulgaria so you must allow time to buy in person. You must have your passport with you when buying these reservations. A double sleeper costs the equivalent of 30 euros.Specialist agencies can help as they use local contacts to buy the tickets and deliver them to hotels or can even meet you in person but you have to pay for this level of service!
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Reservation Sofia to Istanbul

Best answer by mcadv
Thanks for this and to add: this is rather new, as untill before all reports were that it was more empty as taken. Also there was a recent report that the INTern office in Sofia is now closed SUNs.
If available, some more info about which local agents can assist then would be useful for others.
IF stuck and do not want to ait-there should still be several overnite buses-faster too and ending at a more convenient giant OtoGar in IST as that suburban train stop. Bus stat in Sof right to left of trains.
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