Openttd: Why do I have a poor station rating for an industry that has closed?

Solution 1:

Unfortunately when an industry closes you will still get the rating at that station for all time. The good news is that the station rating doesn't affect your standing with the local authorityref and all it does is affect the volume of cargo you receive from that industry. Given the industry is no longer there, it doesn't affect anything other than your ego!

There are two ways out of it:

  1. Fund a new industry near the station
  2. Demolish the station and rebuild it (when the name has reset). You'll have to re-route all your trains, however.