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Props, Vars and CBs

Towns aren't a NewGRF feature of their own but town variables can be accessed via the parent scope of stations, houses and industries.

Town variables

name value range comment
is_city [0 | 1] 1 if this town is marked as a "city", 0 if it's not.
cities_enabled [0 | 1] 1 if the advanced setting for cities is enabled, 0 otherwise.
town_index 0..65535 NML 0.6 This returns the index of the town in the town array. You can use this value to treat some towns specially. (For example, the first town on the map can be considered the capital and you can allow a Parliament to be built there, but nowhere else)
has_church [0 | 1] 1 if there is a church in the town.
has_stadium [0 | 1] 1 if there is a stadium in the town.
population 0..65535 Population of the town
num_houses 0..65535 Number of houses
percent_transported_passengers 0..100 Percentage of all passengers available for transported that were transported.
percent_transported_mail 0..100 Percentage of all mail available for transported that was transported.
town_zone_0_radius_square 0..65535 See TownZones page in NFO specs
town_zone_1_radius_square 0..65535
town_zone_2_radius_square 0..65535
town_zone_3_radius_square 0..65535
town_zone_4_radius_square 0..65535