Also, I honestly think that a comfortable long distance train İstanbul – Budapest (or even Vienna) would attract a decent number of passengers. Now, the connection at Sofia is a disaster and Serbian tracks and trains are, unfortunately, in extremely bad condition. Romanian cars are not that much better and the connection in Bucureşti Nord (or Videle) is just as bad as in Sofia. The horrible connections and cars even put me off, and I’m a very stubborn train traveller. This summer again, I missed my connection at Sofia forcing me to spend a day there.