Tunnel

A tunnel is a feature found on many roller coasters where a section of track is enclosed in a structure, or underground. Some tunnels have lighting effects, while others are kept in complete darkness.

Over-ground tunnels

Most tunnels are built above ground, mostly because they are cheaper to build and easier to maintain. Over-ground tunnels often have lighting effects.

Underground tunnels

As the name suggests, an underground tunnel is a segment of track built below the ground level of the roller coaster, and sometimes the park. These are often made out of concrete, and, depending on the intended atmosphere of the ride, may be lit or un-lit. Also, tunnels can go underwater, an example is Anaconda at Kings Dominion.

Oblivion at Alton Towers has one of, if not the deepest underground tunnel in a roller coaster.

This box: view edit Roller coaster descriptions
Basic elements	Brake run Station
Advanced elements	Hill Headchopper Inversions Pre-Drop Tunnel
Propulsion	Lift hill Cable Catch car Chain Electric Elevator Ferris wheel Friction wheel Spiral Powered launch Counterweight Friction wheel Flywheel Compressed air launch Electric winch launch Hydraulic LIM LSM
Technology	Block brakes On-ride camera On-ride soundtrack Test seat Train Track Transfer track Wheel assembly
Other	Chicken exit Exclusive ride time POV Queue line Rollback Theming

This box: view edit Thrill elements
Inverting	Banana roll Barrel roll downdrop Batwing Bowtie Butterfly Cobra loop Cobra roll Corkscrew Cutback Demonic knot Dive drop Dive loop Diving turn Dog tongue Double inverting dive loop Double inverting stall Drachen fire dive drop Finnish loop Fly to lie / Lie to fly Flying snake dive Heartline roll Immelmann Inclined dive loop Inclined loop In-line twist Interlocking corkscrews Interlocking loops Lagoon roll Negative-g stall loop Norwegian loop Over-banked inversion Pretzel knot Pretzel loop Raven turn Reverse cobra roll Reverse sidewinder Roll out Roll over Rollover camelback Saxophone Scorpion tail Sea serpent Sidewinder SkyLoop Step-up under flip Tongue Top-Gun stall Twisted horseshoe roll Twisted in-line rollback Vertical loop Wraparound corkscrew Zero-g roll Zero-g stall Zero-g winder
Non-inverting	Dark/Show section Double down Hairpin dive Hairpin turn Hammerhead turn Helix High five Hill Horseshoe Jr. Scorpion tail Kickflip Non inverting cobra roll Non inverting loop Octopus arm Outward banked airtime hill Over-banked curve Over-banked pretzel knot Pretzel curve Splashdown Splash effect Splash track Stengel dive Switch track Tilt section Trick track Triple dip Tunnel Turntable Twisted dive Twisted top hat Vertical drop track Vertical rollback Vertical spiral Wagon wheel Water brakes Wave turn Windcatcher tower
Variable	Jr. Immelmann Top hat