i spawned somewhere in stone or something then suffocated
then i walked the track to the end i didnt know i was going the wrong way
what a long walk
then i used invedit for some carts
rode a third of the track and got the achivement
rode to the begining though
the see if there were cart
spawn point needs to be fixed
im just trying to help people out who want to get all the achievements, this being the hardest( in my opinion)... plus think about how long it would take to collect the materials necessary for making that much track... its practically impossible, since it took 8 hrs just to lay down the tracks on the map....
*NOTE* made file into a .rar as requested. hopefully this will be easier to download... (i had to download all the files myself due to corruption and it took forever!!). so the .rar will help out alot.
Maybe you should add a wall around the tracks. When I tried using it I had to wait till it was night, then put it on peaceful, go back to the start due to being knocked back by a sheep halfway through, then completing it. Or maybe you should save the world file while it is night time to make it easier on people.