Most roller coasters let you settle into your seat and anticipate the drops ahead. X2 at Six Flags Magic Mountain takes that comfort away entirely. Perched on the outside of a wide wing-shaped train, you ascend the lift hill facing backwards — then spend the next two minutes never quite knowing whether you’re facing forward, backward, skyward, or straight down toward the pavement.
Opened in January 2002 as simply ‘X’, this 175-foot steel monster was the world’s first 4th dimension roller coaster, built by Arrow Dynamics and designed by engineer Alan Schilke. A $10 million renovation in 2008 relaunched it as X2 with new lighter trains, a dramatic red-and-black repaint, on-board audio, and fire effects. More than two decades on, no ride quite replicates what X2 does — and it still draws some of the longest queues at any theme park in Southern California.
Quick Answer
X2 is the world’s first 4th dimension roller coaster, located in the Baja Ridge section of Six Flags Magic Mountain in Valencia, California. Its seats rotate 360 degrees independently of the track — driven by a separate pair of rails and a rack-and-pinion gear system — sending riders through a near-vertical 88.5-degree first drop at 76 mph, backed by on-board audio and flame thrower effects.
X2 Stats at a Glance
Park: Six Flags Magic Mountain, Valencia, California. Section: Baja Ridge. Type: 4th Dimension steel roller coaster. Manufacturer: Arrow Dynamics. Designer: Alan Schilke. Opened: January 12, 2002 (as X); relaunched May 24, 2008 (as X2). Height: 175 feet (53 m). First drop: 215 feet (66 m) at 88.5 degrees. Top speed: 76 mph (122 km/h). Track length: 3,610 feet (1,100 m). Inversions: 2. G-force: 4Gs. Trains: 3 trains, 7 cars each, 28 riders per train. Hourly capacity: approximately 1,600 riders. Height requirement: 48 inches (122 cm).
How the 4th Dimension Works
On a conventional roller coaster your seat stays aligned with the direction the train is traveling. On a 4th dimension coaster the seats rotate forward and backward on their own independent axis — that rotation is the ‘fourth dimension’ added on top of the normal three axes of coaster motion. Arrow Dynamics engineer Alan Schilke developed the system after imagining a roller coaster combined with the spinning chaos of a carnival Zipper ride.
The mechanical solution uses four rails instead of the normal two. The inner pair are the primary weight-bearing running rails that support the train’s chassis. The outer pair are dedicated rotation-control rails. A rack-and-pinion gear mechanism connects those rotation rails to the seats: as the rails move up or down relative to the main track at precisely engineered points on the course, they drive the seats to spin forward or backward by a programmed amount. Every flip, dive, and raven turn you feel is the result of that choreographed gear action — not the unpredictable free-spin you might expect.
The Ride Experience, Element by Element
Boarding X2 is already disorienting. Riders sit on either side of the narrow train chassis — two across, exposed on the wings with nothing but the seat structure around them. Before the lift hill begins, the seats rotate to face backwards. You ascend 175 feet watching the queue below shrink, with on-board audio building from a subdued opening track into something more ominous as you near the top.
At the crest the seats pitch forward, locking you nose-down for the 215-foot first drop. At 88.5 degrees the track is nearly vertical — just 1.5 degrees short of straight down — and the rotated seat means you’re already facing the ground before the train has even begun to fall. The drop accelerates the train to 76 mph and pulls 4Gs through the pullout. Because the seat rotation extends the time you’re aimed at the ground, the drop registers as longer and more relentless than the numbers suggest.
The layout continues through two raven turns — sweeping outside-banked dives that bring the train close to the terrain — along with a skydive element and a backward backflip inversion, each accompanied by additional seat rotations. Flame throwers fire during the outside raven turn: close enough that riders on the outer seats feel the heat as they spin toward the flames. A fog system near the first drop adds atmosphere when operational. The brake run levels the seats back to upright and the audio fades out — leaving most riders quietly recalibrating which way is up.
History: From X to X2
The story of X begins with creative ambition and a manufacturer that couldn’t survive building it. Arrow Dynamics — the company behind the first modern tubular steel coasters, the first modern looping coaster, and decades of industry milestones — was contracted by Six Flags Magic Mountain in the late 1990s to construct a full-scale prototype 4th dimension ride. Designer Alan Schilke pushed for a ride at hypercoaster scale. Park president Gary Story agreed, insisting the coaster should match the dimensions visitors would expect from a signature attraction visible near the park entrance.
Construction overran both budget and schedule. Arrow Dynamics filed for Chapter 11 bankruptcy protection shortly before the ride’s debut, having reportedly lost millions on the prototype project. The coaster had a soft opening on December 24, 2001, with the official public opening on January 12, 2002 — but by June of that year a fault in the seat rotation mechanism forced closure for repairs, and the ride didn’t reopen until August. X was Arrow Dynamics’ final completed project; the company closed not long after.
By late 2007 Six Flags committed $10 million to a comprehensive overhaul. The original pink-and-yellow color scheme was replaced by red track on black supports. First-generation trains were swapped for a lighter third-generation design with a new pneumatic restraint system that improved both reliability and comfort. On-board audio was installed for the first time, along with fog effects near the first drop and flame throwers positioned along the course. A third train was added, increasing hourly capacity significantly. The relaunch on May 24, 2008 introduced the coaster as X2, and the upgraded version addressed most of the operational difficulties that had plagued the original.
Arrow Dynamics and the 4th Dimension Legacy
Arrow Dynamics spent four decades defining what steel roller coasters could do — from the earliest tubular steel track designs in the 1950s to the first modern loop coasters of the 1970s and the first hyper coasters of the late 1980s. X was their attempt to do something categorically new, and it succeeded creatively even as it contributed to the company’s financial collapse. The 4th dimension concept was subsequently licensed and continued by S&S Worldwide, which has built additional 4th dimension coasters at parks worldwide under the S&S name.
X2 retains a distinct status as the original — the proof-of-concept ride that demonstrated controlled seat rotation could work at scale and deliver a genuinely new experience. No subsequent 4th dimension coaster matches X2 for track length or top speed, and none combines its scale with fire effects and on-board audio in the same way. For coaster historians and enthusiasts, riding X2 means riding the prototype that ended one company and founded a new coaster category.
Planning Your Visit: Tips for Riding X2
Height requirement: 48 inches (122 cm). X2 carries standard Six Flags health and safety warnings including restrictions for riders with heart conditions, recent surgery, back or neck problems, and motion sensitivity. The 4Gs of force through the first drop and the unpredictable rotations make this more physically demanding than most coasters — take the warnings seriously.
Wait strategy: X2 consistently logs some of the longest queues at Six Flags Magic Mountain, particularly on weekends and holidays. The ride’s position in the rear Baja Ridge section means the walk from the entrance takes a few minutes, which discourages some casual visitors but doesn’t deter the enthusiast crowd. Arriving before the park opens and heading to X2 first is the most reliable way to ride without a long wait. Six Flags’ Flash Pass skip-the-line program is available and frequently worth the cost on peak days.
Seat selection: All seats on X2 rotate through the same programmed sequence, so there is no mechanically superior position. The outer seat on each car sits farther from the train’s centerline and tends to feel more exposed during rotations — many enthusiasts prefer it for that reason. Neither side of the train offers a meaningfully different layout experience, so take whatever seat the queue delivers and skip the deliberation.
X2 FAQs
What is a 4th dimension roller coaster?
A 4th dimension coaster has seats that rotate 360 degrees forward and backward on their own axis, independent of the direction the train is traveling. Arrow Dynamics engineer Alan Schilke achieved this using two extra rails alongside the main track and a rack-and-pinion gear mechanism that spins the seats at programmed points on the layout. X2 at Six Flags Magic Mountain was the world’s first.
How fast does X2 go?
X2 reaches a top speed of 76 mph (122 km/h), achieved after a 215-foot drop at a near-vertical 88.5-degree angle — just 1.5 degrees short of straight down.
What is the height requirement for X2?
Riders must be at least 48 inches (122 cm) tall to ride X2 at Six Flags Magic Mountain.
Who designed and built X2?
X2 was designed by engineer Alan Schilke and manufactured by Arrow Dynamics. It was Arrow’s final completed roller coaster before the company filed for bankruptcy in 2001, partly due to cost overruns building this prototype.
When did X2 open at Six Flags Magic Mountain?
The ride first opened as ‘X’ on January 12, 2002. After a $10 million renovation adding new trains, on-board audio, fire effects, and a red-and-black repaint, it reopened as ‘X2’ on May 24, 2008.
Are there other 4th dimension roller coasters besides X2?
Yes. After Arrow Dynamics closed, S&S Worldwide acquired the 4th dimension technology and has built additional rides of this type at parks around the world. X2 was the first and remains one of the largest and fastest examples of the category.
Get More from X2
Log the coasters, stadiums, and venues you’ve experienced, rate X2, and see what your friends thought. Get the ThrillZing app.