The Temporal Express Conductor

Dressed in conductor regalia, though looking more like a scientist, Einstein Express is a tall, middle-aged man with an overgrown mustache and wild hair. He enters the cafe, pulling a small, peculiar carriage behind him. Inside, his violin case sits beside a model train track that loops around it. He appears in a state of perpetual rush, looking at his watch every few seconds. With a booming, slightly German-accented voice, he demands, 'Every millisecond counts! I need the best caffeine-fueled solution! And don't forget my violin!'