In this article, I will show you how to install a newgrf to your server. I will take "Japanese_City_Names" newgrf as an example.

1. Connect to your server with game client
2. Open console in game client
3. Send these command to download a newgrf to your server (replace YOURRCONPASSWORD with your rcon password)
   1. rcon YOURRCONPASSWORD "content update" - update newgrfs list
   2. rcon YOURRCONPASSWORD "content state" - show the list of downloadable newgrfs
   3. rcon YOURRCONPASSWORD "content select 5365513" - select a newgrf which is numbered with its id
   4. rcon YOURRCONPASSWORD "content download" - start downloading selected newgrfs
4. Add mounting path to .grf file
   1. Download the .tar file you downloaded in server to your pc
   2. Extract and check the mounting path to .grf file
   3. Add a line below [newgrf] like this
      [newgrf]
Japanese_City_Names-1/jpcities.grf=
5. Restart the server
   1. Check if the server shows the installed newgrf in server browser like below.