Minecraft wiki entry for Things_not_to_do, associated text: Alternatively, if the player is making a transport system in the Nether, they can create a pathway exclusively for the horse to effectively create a "horse subway" that travels extremely fast with the combined speed of the horse and the distance reducing effect of the Nether. This is less convenient for the player while traveling through the nether but it does take much less setup than a minecart system which is less tedious and less dangerous to use, but harder to build.