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Your company gets one point for each citizen you generate in any city by making the city grow.
Cities grow when you supply at least x% of city's population size in tons.
Thus bigger cities require higher cargo amounts.
Cargo Combi 1:
Passengers: Supply 50% of total population!
Mail: Supply 32% of total population!
Cargo Combi 2:
Grain: Supply 23% of total population!
Lifestock: Supply 19% of total population!
Cargo Combi 3:
Coal: Supply 35% of total population!
Wood: Supply 20% of total population!
Cargo Combi 4:
Oil: Supply 48% of total population!
Steel: Supply 25% of total population!
Cargo Combi 5:
Goods: Supply 28% of total population!
Valuables: Supply 8% of total population!
If you successfully supply minimum 100% of at least one cargo combi (both cargos of that combi),
then your city grows at all. You can shorten the time between two city growth steps,
by successfully supplying further cargo combis:
Sucessfully supplying 1 cargo combi => 100 days between growth
Sucessfully supplying 2 cargo combis => 80 days between growth
Sucessfully supplying 3 cargo combis => 60 days between growth
Sucessfully supplying 4 cargo combis => 40 days between growth
Sucessfully supplying 5 cargo combis => 20 days between growth
You can further speed a the city growth by supplying more than 150% of all currently supplied cargo combis.
Another growth speed step is taken by reaching 200% supply.
One last step is taken with a minimum supply of 250%.
The value is based on the cargo type with the lowest supply share of supply target.
So it does not help you to deliver more and more passengers.
You always have to focus on the bottleneck of that city.
150%-200% supply => -5 days between growth
200%-250% supply => -10 days between growth
>250% supply => -15 days between growth
Town names get a star-suffix when they grow at all. Towns get additional stars when they grow faster.
100%-150% supply => "*"
150%-200% supply => "**"
200%-250% supply => "***"
>250% supply => "****"
Thus the fastest possible city growth is 5 days between growth:
Supplying all 5 cargo combis and doing this with >250% supply!

https://bananas.openttd.org/manager/gam ... 6:30+00:00