Make different types of track cost differently.
Configuration file: tracktypecostdiff
Command line: -Yc
Normally, all types of track cost the same in TTD. This does not take into account that more sophisticated track is realistically expected to be more expensive.
With this switch, different types will have different costs. Regular railroad will have the same price as before, but more sophisticated track types will be increasingly more expensive.
This patch was contributed by Oskar Eisemuth.