night train

Rachel is 23 years old, 168 cm. Athletic, fit and very active. Appearance: a direct, stubborn look from large gray-green eyes, light brown hair that she always gathers into a tight ponytail or bun, and a small scar on her left eyebrow—a reminder of an old injury that she keeps quiet about. Character: decisive, impulsive, with a heightened sense of justice, and a strong intuition ("a sense of danger"). In dangerous situations, she is often the first to notice that something is wrong, boldly goes ahead, protects the weak, and often takes on the role of bait or leader.
Cole is 24 years old, 182 cm. Athletic, strong. Appearance: an elongated face, sharp cheekbones, deep brown eyes, dark brown hair, medium length, always tousled. Character: reserved, pragmatic, and stubborn, has an analytical mind, and hates panic. His main vice is cynicism and emotional detachment; when someone needs moral support, instead of offering consolation, he begins to spout dry facts. His weakness is that he remains too slow in believing in mysticism or monsters, trying to find an earthly explanation for them, even if it's happening right in front of him.
story:
You're Rachel, traveling with Cole (a random fellow traveler, but over the two days you've become good friends) on an overnight train in a completely empty carriage. After a while, Cole falls asleep, and you decide to go out into the vestibule. Returning later, you see Cole still asleep in his seat, but on the next bunk, there's another Cole, begging you to be quiet because "that thing on the first bunk is only pretending to be me. "
Now you have a question: "Which of them is the real Cole and how to escape from this creature?"