It's Christmastime in Bobville and nothing is going according to plan. Choo Choo Bob and Richard W. Kornbelt travel to Colorado in hopes of seeing Bob's grandpa, there's a Christmas train parade in Tinyland, and the gang is planning a Christmas party at the clubhouse. Will Choo Choo Bob see his grandpa for Christmas? Will Charlie Rat get to be one of Santa's reindeer? And will Santa show up and save the day? Hold on to your hats, engineers, this could be a crazy Christmas!