Rocky Mountain Coasters (R.M.C., formerly Rocky Mountain Construction) is an American roller coaster manufacturing and construction company based in Hayden, Idaho, United States. It is best known for its I-Box track and Topper Track for wooden roller coasters. Founded by Fred Grubb and Suanne Dedmon in 2001, it has built over 20 roller coasters. In 2023, it merged with amusement ride manufacturer Larson International.
History In 2001, Rocky Mountain Construction was established by Fred Grubb and Suanne Dedmon. Fred Grubb previously had experience in the construction industry having worked on custom homes and zoo exhibits. The company has worked on several projects including the construction of roller coasters, water parks, steel buildings, miniature golf courses and go kart tracks.
In 2009 Alan Schilke of Ride Centerline began providing design and engineering work for Rocky Mountain Construction. He previously worked with Arrow Dynamics (later S&S Worldwide) to design Tennessee Tornado, Road Runner Express, and X. Working with Rocky Mountain Construction, Schilke and Grubb designed the I-Box track for wooden roller coasters. The first installation of this track technology debuted on New Texas Giant at Six Flags Over Texas in 2011.
In late 2011, Schilke announced that the company would be working on two projects throughout 2012 which would both open in 2013. These were later revealed to be an I-Box retrack of The Rattler at Six Flags Fiesta Texas and a new roller coaster designed from scratch at Silver Dollar City named Outlaw Run. The track technology used for Outlaw Run, which allows a square beam of wood to be twisted, took 4 years to develop. It allows Rocky Mountain Construction to design layouts with maneuvers that are not traditionally possible with wooden roller coasters such as heartline rolls. Grubb has stated the technology could be used for new elements in the future. Some new elements were realized with the announcement of Goliath at Six Flags Great America. The ride features an 85 degree drop as well as a dive loop and a zero-g stall. The ride opened in June 2014.
In 2013, Rocky Mountain Construction signed a deal with Dutch amusement ride firm Vekoma. The agreement allows Vekoma to sell Rocky Mountain Construction's roller coasters outside the North American market. In 2014, Kolmården Wildlife Park in Sweden announced plans to build the first Rocky Mountain coaster in Europe called Wildfire, which opened on June 28, 2016. To handle increased demand, Rocky Mountain Construction opened a new factory, twice the size of their existing one, in August 2014.
In a press release on April 11, 2023, amusement ride manufacturer Larson International, known for its Fire Ball models, merged with Rocky Mountain Construction.
Technology
I-Box Track (also known as Iron Horse Track): Rocky Mountain Construction's most common product. A formation of replacement steel track for wooden roller coasters. The first installation of this track was on Texas Giant at Six Flags Over Texas. I-Box (Large Track Version): Specifically designed to run the S&S Free Spin 4D coaster clones. Topper Track: Installed on several coasters around the United States. The track is designed to reduce the maintenance required for a wooden roller coaster and provide a smoother ride experience. This grout-filled, running steel track replaces the upper layers of laminated wood. Wooden roller coaster trains: specifically designed to run on the company's own Topper Track, however, they could be added to other wooden roller coasters as well. The trains feature steel wheels as opposed to polyurethane wheels found on most trains. 208 ReTrak: Debuting in 2021 on Silverwood's Tremors roller coaster, similar to the I-Box track, 208 is designed to be used as a replacement for sections of old wooden coasters to decrease maintenance and add lifespan to the coaster as well as increase rider comfort and enjoyment. Wild Moose: A version of the classic wild mouse coaster type using I-Box track, featuring entirely redesigned trains and a compact layout and its first will be Forbidden Lair at Lost Island. Raptor Track: A single rail steel track that features inline seating for passengers. T-Rex Track: Similar to Raptor track, the T-Rex track is a single rail track. It is a larger single rail model that permits two seat-wide trains on the track rather than one. Swing Axle Trains: Debuting in 2018 on Twisted Timbers, the Swing axle train features a pivoting front axle allowing for smoother transitions between elements.
List of roller coasters
, Rocky Mountain Construction has built or refurbished 29 roller coasters around the world.Rocky Mountain Construction - rcdb.com As of 2026, 28 of them are currently operating.
Name Model Park Country Converted From Opened Status Ref Image New Texas Giant I-Box - Steel Six Flags Over Texas United States Texas Giant 2011 Outlaw Run Topper Track - Wood Silver Dollar City United States N/A 2013 Iron Rattler I-Box - Steel Six Flags Fiesta Texas United States Rattler 2013 Medusa Steel Coaster I-Box - Steel Six Flags Mexico Mexico Medusa 2014 Goliath Topper Track - Wood Six Flags Great America United States N/A 2014 Twisted Colossus I-Box - Steel Six Flags Magic Mountain United States Colossus 2015 Wicked Cyclone I-Box - Steel Six Flags New England United States Cyclone 2015 Wildfire Topper Track - Wood Kolmården Sweden N/A 2016 Wind ChaserFormerly Storm Chaser I-Box - Steel Kentucky Kingdom United States Twisted Twins 2016 The Joker I-Box - Steel Six Flags Discovery Kingdom United States ROAR 2016 Lightning Rod Topper Track & I-Box - Wood & steel Dollywood United States N/A 2016 Twisted Timbers I-Box - Steel Kings Dominion United States Hurler 2018 Steel Vengeance I-Box - Steel Cedar Point United States Mean Streak 2018 Twisted Cyclone I-Box - Steel Six Flags Over Georgia United States Georgia Cyclone 2018 Wonder Woman Golden Lasso Coaster Raptor Track - Steel Six Flags Fiesta Texas United States N/A 2018 RailBlazer Raptor Track - Steel California's Great America United States N/A 2018 Hakugei I-Box - Steel Nagashima Spa Land Japan White Cyclone 2019 Untamed I-Box - Steel Walibi Holland Netherlands Robin Hood 2019 Zadra I-Box - Steel Energylandia Poland N/A 2019 Stunt Pilot Raptor Track - Steel Silverwood Theme Park United States N/A 2021 Jersey Devil Coaster Raptor Track - Steel Six Flags Great Adventure United States N/A 2021 Iron Gwazi I-Box - Steel Busch Gardens Tampa Bay United States Gwazi 2022 Wonder Woman Flight of Courage Raptor Track - Steel Six Flags Magic Mountain United States N/A 2022 ArieForce One I-Box - Steel Fun Spot Atlanta United States N/A 2023 Wildcat's Revenge I-Box - Steel Hersheypark United States Wildcat 2023 Fire in the Hole I-Box - Steel Silver Dollar City United States N/A 2024 Sköll & Hati Raptor Track - Steel Gyeongju World South Korea N/A 2024 YoY Raptor Track - Steel Walibi Holland Netherlands N/A 2025 Fire Runner Raptor Track - Steel Lost Island Theme Park United States N/A 2025 Forbidden Lair Wild Moose - Steel Lost Island Theme Park United States N/A 2027 Raptor Track - Steel Family Kingdom United States N/A 2027 I-Box - Steel Walibi Belgium Belgium Loup-Garou 2028
Other projects Topper Track, no layout changes
Tremors at Silverwood Theme Park
Construction
Aftershock at Silverwood Theme Park Corkscrew at Silverwood Theme Park El Toro at Six Flags Great Adventure T Express at Everland Timber Terror at Silverwood Theme Park Tremors at Silverwood Theme Park Villain at Geauga Lake Timberhawk at Wild Waves Theme Park
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Repairs
The Boss at Six Flags St. Louis Corkscrew at Silverwood Theme Park Cornball Express at Indiana Beach Hoosier Hurricane at Indiana Beach Hurricane: Category 5 at Myrtle Beach Pavilion Mega Zeph at Six Flags New Orleans The Predator at Six Flags Darien Lake Psyclone at Six Flags Magic Mountain Shivering Timbers at Michigan's Adventure - 208 ReTrak Timber Terror at Silverwood Theme Park Tremors at Silverwood Theme Park - 208 ReTrak Twister II at Elitch Gardens Theme Park Woodland Run at Kentucky Kingdom Hurler at Kings Dominion Blazing Fury at Dollywood Hell Cat at Clementon Park - 208 ReTrak
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Miscellaneous
Boulder Beach – water park Great Escape – Skycoaster installation Six Flags America – Skycoaster installation Six Flags Discovery Kingdom – Skycoaster installation S&S Free Spin 4D clones - Construction of the track using the I-Box Large Version Kentucky Kingdom – Skycoaster installation Stoneridge Resort – miniature golf course Triple Play Indoor Water Park – water park Utah Olympic Park – Xtreme ZipRiders Wild Water West – water park, go kart track and miniature golf course
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