Infrastructure sharing is a patch in development from a few users.
Originally proposed and written by Gedemon it was subsequently maintained by a few other users . Currently there's a re-write in progress. Look at the tt-forums thread and post suggestions there or here ;) If you find problems, please always state the patch version or - if accessing the repo - the revision which you used.
Developers: Hirundo (aka Swallow), Aali, Ammler, planetmaker
Forums: Infrastructure Sharing
Development Portal: http://mz.openttdcoop.org/is2/
Mercurial Repository: http://mz.openttdcoop.org/hg/is2
A patch against OpenTTD trunk can be found at the development portal.
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IT DOESENT'T WORK