Build an underground network

An underground network is usefull to enlarge creation possibilities.
They can be a bit complicated tunnels or very complew underground networks such as a metro network.
Plus, metro is a solution to transport a lot of passengers through a city without modifying it.
Undersea tunnels can also be made, they are useful on not too long distances.

In the latest releases of Simutrans, there are two kinds of underground view. The first one show everything under the ground, it can be used by the shortcut “U”.
There is another useful view : the sliced view. It allows to see underground structures on only one level. It's convenient for underground construction. To use it, go in display options.

When you normaly build a tunnel, an underground way goes from a tunnel extremity straight to the other one.

To build a network, it would be more convenient to have only one tunnel entry. To build a tunnel entry, use the the tunnel tool when keeping ctrl key on.

To build underground ways then, the usual way tool won't be used as on the ground. You have to use the tunnel tool, the same which you built the tunnel entry with.

The underground ways have the same behaviour as over ground ones. You can build signals, stations, depots, you can electrify them … You can also build tram ways in road tunnels.

Underground slopes are a bit difficult to use. If you build a network with slopes, you should better use the sliced view.
If you want to build a down slope at the extremity of a way, you have to use the terrain modification tool.
That's the same for up slopes but because of the sliced view caracteristics, you should build your network from up to down.

En fait si vous cherchez un peu vous verrez qu'il est possible d'aller en dessous du niveau de la mer avec vos tunnels. C'est précisemment de cette manière que l'on construit des tunnels sous-marins.

En revanche faites attention à la profondeur de l'eau, vous ne pourrez pas construire un tunnel au niveau -1 sous une mer qui a une profondeut allant jusqu'à -3.
D'autre part l'utilisation de la vue en tranches est obligatoires pour voir sous l'eau.


Maintenant que vous savez tout sur les tunnels, à vous les métros les plus tordus ;)