Test server is been running for a while, but I never did write about it. So, we have Server #0 aka CityMania TEST server. It is used for trying any new stuff that for some reason doesn't seem to be ready for deployment on our main servers. That may be new game mode, new server feature, new OpenTTD version and so on.
Despite that it will normally function as any other server meaning your game will be scored, you'll get exp, etc. But keep in mind that
it's a test server after all, something can go wrong and I'll have to reset that game afterwards (especially if it's a new game mode being tested). So to keep out players that aren't aware of it, server will usually be protected with simple password "test".
That said, sometimes I will need your help with testing, and that's the main reason I started this topic. I'll be posting here updates when I introduce something new to test. Feel free to try it and give any feedback. The more people will test it the less chances are that bugs will make their way to main servers.