Metro

The Metro section of transport is a very advanced tool. It minimizes space and traffic by using a system of underground railroads.

Metro Station
The Metro Station is where the subway trains are first spawned at. It also acts as a massive metro access point. It does cost a lot, at 38kT. However, since it is unlocked when you become a metropolis you are probably making at least 100kT.

Metro Access Point
The Metro Access Point is where your trains arrive at. The MAP as I like to call it, makes it much easier to travel then metro station to metro station. It is the equivalent to bus stops.
 * It requires metro tunnels.
 * It requires metro stations.

Metro Tunnel
The Metro Tunnel is what connects everything. It is underground so you don't need to worry about space.
 * It requires metro stations.

Trivia

 * The Metro Station does not work when placed on different heights.