Watch the cutscenes for a few minutes until you need to find a radio transmission. Adjust the radio frequency with and until you find the signal. Continue on with the cutscene and eventually the train will be given a name, unlocking:
Unlocked by 34,094 tracked gamers (88% - TA Ratio = 1.06)
Once Artyom stands up and goes to the map, interact with it and you'll be given the choice of exploring the train () or continuing on to the next level (). Choose so you can stay on the train.
Turn around and go to the desk you were originally sitting at, then interact with the chair to sit down. Hold to interact with the radio again, then adjust the radio frequency until you find some music, unlocking:
Unlocked by 14,290 tracked gamers (37% - TA Ratio = 1.64)
Next, head down the stairs, and on the crate to your left is Diary 11/71 (Survey Report). Head back to the map and choose to proceed forward, completing the mission.
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