Minetest is an infinite-world block sandbox game and a game engine, inspired by Infiniminer, Minecraft and the like.
The community is about the great and open source sandbox game writed in Lua, Minetest.
Feel free to call players for a multiplayer game or publish your project of a mod and everthing related.
Download the game. Check out the wiki.
I've tried the standard Minecraft one and several variations of it, but none work. The standard one below just doesn't give the cart enough time to unload. I tried placing 3 hoppers in a row and one in a closed track circuit, but those didn't work either.
Standard
Circuit
Hmmm. I have somewhere I should add one. I'll give it a try and see if I have any luck.