I'm still playing from time to time an OpenTTD game I started more than 10 years ago, maybe even 15 years ago: the earliest save I still have is from 2009 but i

I'm still playing from time to time an OpenTTD game I started more than 10 years ago, maybe even 15 years ago: the earliest save I still have is from 2009 but it was already ~300 years into the game. Started in year 1900 I think; now is year 4100 and some.