### Advtrains Privilege Guide
All privileges are automatically granted to singleplayer, but for
multiplayer servers this might be interesting.
In this document, "protected from" means the player does NOT have access to the area, while "protected by" means the player has (semi-)exclusive access to the area.
There are 3 groups of privileges introduced by advtrains:

## Trains
For a player to build his own trains and driving them, the player needs
the 'train_operator' privilege. This privilege no longer allows him to
control any train, only the ones that he owns or that he is whitelisted on.
The owner of a wagon can write a whitelist which players are allowed to
operate his wagon using the wagon properties dialog.
Players having the 'train_admin' privilege can always drive, build and
destroy any train.

## Tracks*
The area 1 node around and 4 nodes up from each track node is protected.
Players that don't have the 'track_builder' privilege can not build or
dig (or modify) anything inside this area.
If a player has this privilege and tries to modify anything that is in the area of a track node which is protected from him, he also can not do this.
(that said, while checking protection, the area around a track is
treated as the track node itself)
Note that having 'protection_bypass' automatically implies 'track_builder' due to internal engine mechanics. (see comments in source code)

## Turnouts and Signals*
Players without the 'railway_operator' privilege can not operate signals
and turnouts.

* If the configuration option 'advtrains_allow_build_to_owner' is set,
an exception applies to players missing the required privileges when
they are in a protected area that they have access to. Whether the
area is protected from others is checked by checking for protection
against a dummy player called '*dummy*'

## Privileges of extensions:

* atlatc:
This privilege allows to create and modify LUA code in LuaATC rails added by the advtrains_luaautomation mod, as well as to create and manage code environments.

* interlocking:
This privilege allows to build, set up, configure and control all sorts of interlocking equipment.
Players without this privilege are still allowed to set and cancel routes (under the condition that they have train_operator).