This is minecart that magically appears when you right click a section of rail with an empty hand. You are instantly transported into this cart. The cart is frictionless and therefore doesn't need any powered rails to go up hills or for long distances. Simply press a direction key and off you go!
Once you have reached your destination all you have to do is dismount, left shift by default, and you'll be instantly ejected from the mine cart and the cart will then vanish. So no lingering entities!
It works with any rail from any mod.
Available at https://minecraft.curseforge.com/projects/terracart-reloaded and also in Twitch App for Minecraft.