First Class Overnight Train Georgia to Azerbaijan (scary border crossing)

We traveled overnight in a first-class cabin from Tbilisi to Baku, figuring out the train and settling in for the 12-hour journey. At the border, we were questioned about having visited Armenia, but the process was ultimately painless and we were allowed into Azerbaijan. After sleeping on the train, we arrived in Baku, found our Airbnb host, and settled into our accommodation.