Suddenly, when the two trains seemed to have stopped because they were both moving at the same slow speed, a blind flew up and Mrs McGillicuddy looked into the lighted first-class carriage that was only a short distance away.
Then she gasped and stood up.
Standing with his back to the window was a man. His hands were round the throat of a woman, and he was slowly strangling her. Her eyes were wide open and her face was purple. As Mrs McGillicuddy watched, the woman’s body collapsed. At the same time, the other train began to go forward faster and a moment later, it had passed Mrs McGillicuddy’s train and disappeared.
Then the door of her carriage opened and a man said, 'Ticket, please.
– 4.50 From Paddington