All builders need to comply with an given assigned budget & additional funds account. Every builder mind need extra parameters to function properly.
- Inner city (town_id, max_stations)
- Inter city (town_ids[], max_stations)
- Industry/station to industry/town/station (source_id, destination_id)
- can be used to transfer from or to
- Inter city (town_ids[])
- without this the others can't be build. But should be considers only once
- Airport (town_id, station_ids[])
- Airport + Busses (town_ids[], station_ids[])
- Industry to Industry/Town (source_id, destination_id)
- Inter city (town_ids[])
- Inter city
- Industry to Industry/Town