TRM: Track and Road Pollution

=== PART OF TRANSPORT REWORK MOD ===

Empty tracks stop polluting.

In the base game every railway track pollutes its surroundings even when no train runs on it, simple tracks about 2, standard tracks 4 and high-speed tracks 6 per 100 m, so a railway through a town costs growth no matter how clean the trains are. With this mod that pollution is gone by default, and pollution from the trains themselves is unchanged.

=== FEATURES ===

• Track pollution scaled or removed. The pollution that tracks emit by themselves goes to 75%, 50%, 25% or 0% of the base game value. Station tracks follow their track type.
• Roads from other mods. No road or tram track in the base game emits pollution of its own, so the road setting only affects roads added by other mods.
• Vehicles unchanged. Pollution and noise from trains, trams and road vehicles stay as in the base game.

=== SETTINGS ===

• Passive Track Pollution ("0%" to "100%", default "0%"). The pollution that railway tracks emit by themselves, whether or not any train runs on them. In the base game simple tracks emit about 2, standard tracks 4 and high-speed tracks 6 per 100 m, with or without catenary, and station tracks 40% of their track type. This pollution lowers the pollution rating of the town in whose municipal area it is emitted. Pollution from trains is not affected.
• Passive Road Pollution ("0%" to "100%", default "0%"). The same for roads and tram tracks. No road or tram track in the base game emits pollution of its own, so this only affects roads added by other mods. Pollution from road vehicles and trams is not affected.

=== INGAME EXAMPLES ===

• Simple track: about 2 pollution per 100 m in the base game, 0 at the default.
• Standard track: 4 per 100 m, high-speed track: 6, station tracks: 40% of their track type.

=== COMPATIBILITY ===

Tracks built or replaced after the mod is active use the new value. Tracks already in a save may keep the pollution they were built with until they are rebuilt. Option changes take effect at the next load.