From the Washington Post. "I wanted to see the country in a different way, so I decided to skip the short flight from Ho Chi Minh City [former Saigon] to Hanoi and take two overnight trains over three days instead...The result was just as I hoped." First leg was on the 22+ hour "Reunification Express," which of course was hardly an express. Read the article at https://www.washingtonpost.com/travel/tips/vietnam-reunification-express-trains/. (Possible paywall, but everyone's entitled to a few free articles per month.)