The document discusses train travel from Hanoi to Da Nang in Vietnam. It notes that Vietnam's air-conditioned trains are a safe, comfortable and inexpensive way to see the country from ground level. Specifically, it provides details on overnight train routes from Hanoi to Hue or Da Nang, stating that taking the train actually saves time compared to flying since the train departs in the evening and arrives in the city center the next morning. Additionally, it highlights that the train journey offers a genuine Vietnamese cultural experience unlike flying.