What's a a historic coaster that you're sad is defunct? [R2000] was the first confirmed coaster to use tubular steel track. It operated sporadically from 1956 to 2007 before disappearing. : r/rollercoasters
Roller coaster - Wikipedia
Types of Roller Coasters - Roller Coaster Types | HowStuffWorks
Ups and downs: The history of roller coasters
Thrill of Steel: The History of Roller Coasters and Steel – Official POSCO Newsroom