The Spruce Caboose was a train. At the time of its making the most beautiful and expensive train ever built. It was, however too big to stay on the tracks and crashed. The remains of the train's Dining car was converted into a restaurant named after the train.
The engine appears to be a streamlined 4-6-4, commonly used in the 1930s and 1940s, but without a tender, so it is a 4-6-4T. Also, it resembles the Pennsylvania Railroad's K4s #3768.