The game interface is in full 3D, with free camera movement. The square grid is no longer rigid, as it was in Railroad Tycoon and Railroad Tycoon 2 - rail and structures can now be rotated 360 degrees.The track building function is not very realistic, as tracks are sometimes built at angles almost at 90 degrees to each other.The economic model has been reworked. In previous games, goods could only be picked up at a station, and revenue depended on the distance between stations. Carloads in RT3 slowly move across the map (representing road and water transport) along the gradient of a scalar field representing price, where supply and demand sites function as sources and sinks. Revenue depends on the price difference between pick-up and delivery. This has several effects; raw materials can find their way to industries and get processed, without any trains involved, and a train does not need to pick up goods at the source.