The interchange is one of the upgrades available at a budget increase. It upgrades a single chosen station to an interchange station, which can hold 18 passengers without starting the overload timer in Normal or Extreme modes, as well as incredibly fast transfer speed. Any station can be upgraded to an interchange station. On the game map, an interchange station will have a larger icon than a standard station. Unlike locomotives and carriages, an interchange cannot be transferred from one station to another.