Railways Through TimeĀ is an expansion forĀ 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 theĀ Railways of the WorldĀ 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 theĀ Railways of the WorldĀ series but introduce the idea of time travel between different eras.
A similar concept was released as an expansion forĀ Age of Steam, calledĀ Age of Steam Expansion: Time Traveler.