Railways Through Time is an expansion for Railways of the World. It requires the pieces, tiles, money, trains, bonds, and rules of the original game, but comes with an innovative board that takes the Railways of the World family in a whole new direction by introducing a third dimension: time. This rules of this new expansion follow the basic gameplay and pick-up and deliver mechanism of the Railways of the World series but introduce the idea of time travel between different eras. A similar concept was released as an expansion for Age of Steam, called Age of Steam Expansion: Time Traveler.