A Möbius Loop Coaster is a clever design. Named after the German mathematician August Ferdinand Möbius, the track has no real beginning or end.
Instead, it is a continuous loop: the first side becomes the second, which then returns to the first. Yes, this is very confusing and very clever.
The result is a racing coaster that uses two tracks with two trains running side by side, so you return to the opposite side of the station you left.
Racer at Kennywood, USA
Grand National at Pleasure Beach Blackpool, UK
Montaña Rusa at La Feria Chapultepec Magico (left track), Mexico
Nitro at Dennlys Parc (on-ride), France