Ключевые слова: alone, back, berlin, boy, casual, caucasian, child, childhood, danger, german, germany, journey, kid, little, little boy, lonely, look, looking, people, person, platform, railroad, railway, s bahn, safe, safety, safety line, sit, sitting, station, summer, three, train, transport, transportation, travel, trip, tube, u bahn, ubahn, underground, urban, viewing, wagon, wait, waiting, watch, yellow, young,