Kennywood, Roller Coaster Wiki
An inside look at Kennywood Park's Steelers-themed roller coaster - Behind the Steel Curtain
Steel Curtain - Coasterpedia - The Roller Coaster and Flat Ride Wiki
Pittsburgh Steelers Kennywood roller coaster: Barrel roll at 197 feet
Discovery World - Roller Coaster Philosophy
Phantom's Revenge - Wikipedia
List of roller coaster elements - Wikipedia
Kennywood's Steel Curtain Roller Coaster Opens July 13
List of roller coaster elements - Wikipedia
Kennywood's Steel Curtain to open July 13 - Pittsburgh Business Times
Steel Curtain - Coasterpedia - The Roller Coaster and Flat Ride Wiki
Racer (Kennywood) - Wikipedia