Frontier Development revealed in a diary that their upcoming theme park sim, Planet Coaster, will have a modular building system.
The developers feel this will give players a greater depth of creative control when constructing rides and attractions.
Having the ability to control and lay each piece of the track allows the players to have their rides become a part of the environment. You will be able to construct roller coasters through tunnel.
Planet Coaster will also allow players to share their creations with other members.