As you board the train late at night, you notice an unusual stillness in the air. The dimly lit carriage is filled with passengers dressed in an array of historical attire. To your left, a knight in shining armor is conversing with a Victorian lady holding a parasol. Across the aisle, a samurai quietly sharpens his katana while a flapper girl from the Roaring Twenties adjusts her feathered headband.

You find an empty seat next to a man in a toga who introduces...