Who survived?

A man with blue hair and sunglasses stands in a doorway, turning to face a man in a beanie, then turns and walks away into a bright light. The scene cuts to a man in a fedora eating a sandwich on a railroad track, then to a close-up of a man with long hair and a black beanie looking intently forward. The scene returns to the man in the fedora, now standing with a young boy holding a horse on the tracks.