Hello, I am looking to go to Istanbul from Sofia, when I searched about it I started to see that I need a pass. I do not understand what is this pass for, is it a railway pass or something else? I am from Azerbaijan so with my passport I am free to go Turkey for 90 days and also I have a residence permit in Lithuania so I can freely travel to Bulgaria without any visa. My question is could someone please explain what are the passes? And do I need it to buy a train ticket from Sofia to Istanbul?
Question
Traveling from Sofia to Istanbul
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