I propose a new feature: Railway companies. It would be nice to couple
this with some user group management mod.
Companies should do the following things:
* All trains will be owned by a company
* Companies will be owned by one or several players
* Access to train driving stand/cargo bay will be limited to members of
the company (solves driving stand and cargo stealing issues in a
sensible way)
* Companies would be assigned a code that would go on the outside of
their rolling stock to aid identification of stray rolling stock
* Access restriction rails could be used to keep certain rails private