Excalibur was a mine train roller coaster at Six Flags AstroWorld in Houston, Texas.
After leaving the station, the ride would turn right, entering a tunnel that doubled as a storage area for extra trains for the coaster.
Finally, the coaster would enter the brake run, leading riders back into the station.
Unfortunately, somewhere between the dismantling process and the shipping to Frontier City, the ride was damaged and would end up never being built at the park.
The same year Excalibur was scrapped, Six Flags AstroWorld would shut down for good.