Small size hardmode map with a network of railways and biomes of all types enclosed in a designated area in order to prevent their inexorable proliferation around the world.
Playing as a new character, you can face difficulties as you progress.
Screenshots
Author: User5101
Installing the card on a PC:
Unpack the archive into
C: \ Documents \ username \ My Games \ Terraria \ Worlds
If you are using tModLoader then unpack into
C: \ Documents \ username \ My Games \ Terraria \ ModLoader \ Worlds