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+#+TITLE: OpenTTD Self Regulating Networks
+#+DATE: 2024-01-12
+[[file:openttd-srnw/srnw_head.png]]
+* Prologue
+Every other year or so I decide to play a game or ten of
+[[https://openttd.org/][OpenTTD]]. Unfortunately I don't remember most of the things I figured
+out in the past so I have to start from first principles.
+In this case, first principles means reading the [[https://wiki.openttdcoop.org/Main_Page][openttdcoop Wiki]]
+[fn::which is quite dense] and watching a bunch of [[https://www.youtube.com/@LugnutsK][LugnutsK]] videos.
+* Self Regulating Passenger Network
+The idea of a self regulating passenger network is to grow a city and
+transport as many passengers out of the city as possible with the
+least amount of train orders.
+
+openttdcoop calls it [[http://wiki.openttdcoop.org/Gametype:ICE_SBahn][Gametype:ICE SBahn]] / [[http://wiki.openttdcoop.org/Self-regulating_SBahn][Self-regulating SBahn]].
+
+The idea is to have (SBahn) stations spread throughout the city that
+collect passengers. Once a train is fully loaded with passengers, it
+drives outside of the city to a transfer (ICE) station and transfers
+passengers to a waiting train that then transports the passengers to a
+far away city to make money.
+
+We do not want to deal with each station individually but run the
+pick-up trains in a loop that automatically visits a station with
+a full load of passengers available.
+
+[[file:openttd-srnw/overview.png]]
+
+For maximum growth and ease of putting train stations into the city we
+are using a 3x3 road grid. A spiral would be even better but it is
+annoying to put train stations into a spiral without disrupting the
+roads too much and creating dead-ends. Dead-ends are very bad for town
+growth.
+
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