Super Bell Subway

Super Bell Subway is the third course in the Bell Cup. The course is included with the Animal Crossing × Mario Kart 8 downloadable content in Mario Kart 8. The course is located in the Golden Bell, a subway station, going through both the station and the track. This track only plays a half of the music when racing on the course, and the other half plays only when watching a highlight reel.

Course layout
The track starts in the station with a U-Turn going to the left right after the start. The track leads into a large area with stairs leading down into the subway. Automatic barriers open to let the players through.

The subway has trains running along the tracks. Throughout the subway, raised platforms can be used to drive on the trains. At the end of the subway, the train track splits and has stairs that lead up back into the large area of the station with another set of stairs taking the players to last bend before the finish. After the U-Turn is a straightaway to the finish line.

Shortcuts

 * Throughout the underground sections of the course, a Mushroom or a Star can be used over gravel sections cutting off turns in the track.
 * At the final U-Turn going to the left, a shortcut can be performed through a grass patch next to the Golden Bell Fountain with a Mushroom or a Star.

References to the Mario Franchise
This track in particular has several references to other portions of the franchise and even the game itself.
 * Several shops appear along the sides of the raceway that make appearances elsewhere in Mario Kart 8, such as Yoshi's Egg Market.
 * The map that is at the starting line of the track appears to connect nearly all of the raceways that appear in Mario Kart 8. Several other detailed maps by the subway lines also include the names of playable courses and the in game business advertisements. Much like an actual subway, there are exits for different stations written on signs above the track stating the names of various courses.
 * Fittingly enough, the track makes a few references to the underground levels in Mario games:
 * This track's music contains pieces from the Underground theme, much like Piranha Plant Slide, which sounds like World 1-2.
 * World 1-2 from Super Mario Bros is referenced by the graffiti found during the underground section.
 * The graffiti also references Bullet Bills, Warp Pipes, Koopa Troopas, and a Piranha Plant, which is located before the World 1-2 graffiti under the ramp. The graffiti near the World 1-2 graffiti references the Koopalings.
 * Also the Toads in the ticket booth use feather pens that are actually cape feathers.

Trivia

 * Like Sunshine Airport, this track features a P.A. voice in the background that can be heard faintly. The female intercom speaks German, including several grammar errors however, and says general things heard in a German train station.
 * This is one of three nitro courses in Mario Kart 8 that doesn't have anti-gravity sections, the other two being Excitebike Arena and Animal Crossing.
 * It is revealed in a map in the subway, that the subway system is underground what seems to be the same town N64 Rainbow Road hovers over.