Rock and Rail (reporting mark RRRR) began in 1998, operating on former Union Pacific track between Parkdale, Colorado and Cañon City, Colorado. It also operates between Pueblo, Colorado and Cañon City on lines purchased from the UP Railway. The tourist line Cañon City and Royal Gorge Railroad also operates on the RRRR's track.
Rock & Rail is the operating partner through the Royal Gorge with the CCRGRR being the tourist RR. At its inception RRRR only operated one line, until obtaining operating rights to continue into Pueblo, Colorado.
Rock and Rail was originally formed to transport rock from a quarry site in Missouri to the UPRR. It held a right-of-way for years until the Tennessee Pass Line was abandoned by the UPRR. At that time INAP, a corporation owned by Bill Fehr, purchased 11.23 miles (18.07 km) of line with the Georgetown Loop RR and transferred the 50% of that line through the Royal Gorge to Rock and Rail, making RRRR the common carrier freight line through the Royal Gorge.