You are an ancient and powerful Vampire of great renown and prestige. You are travelling to VampireCon, a gathering held every fifty years in the town of Tumblewold. You are taking the overnight train (to protect your delicate complexion), and have booked a first class ticket, as befits your wealth and status.
Unfortunately, instead of a feast of upper class mortals, this train car is occupied by several other vampires who had the same idea, every single one of whom are ingrates and vagabonds.