making improvements, reopened Riverside Park on May 29, 1940. Carroll is credited with rescuing Riverside and turning it into the largest theme park in New England. He purchased the plans and cars of the 1939 New York World's Fair Cyclone Roller Coaster and opened a new coaster in 1941. That coaster, now known as Thunderbolt, is operating at the park and is the oldest coaster — in its original location — within the entire Six Flags chain of theme parks. The park continued to add new rides and removed some older ones. The theater and bowling alley were removed in the late 1950s, making Riverside Park a seasonal attraction. Carroll took a liking to auto racing, a sport that was gaining popularity in the Northeast after World War II, and added it to his slate of attractions at Riverside, building the Riverside Park Speedway in 1948, replacing an open-air bandstand. The 1960s was a popular period for stock car racing at Riverside Park. NASCAR began to hold events at Riverside Park Speedway in 1976. in 1968 the park added its first steel coaster called the Wildcat and In 1977, Riverside Park added its first looping roller coaster, The Loop Coaster, later known as Black Widow. The park continued to be successful throughout the 1970s. In 1979 the park invested in an Arrow Development log flume known as Red River Rapids. It became the park's first water ride. It was later renamed Poland Spring Plunge. By the 1980s, the park stopped selling individual ride tickets and began charging a "pay one price" admission. Six years after the opening of Black Widow, the Wildcat was removed and moved to the late Rocky Point Park in Rhode Island. In 1983, Riverside Park added its third roller coaster, which was also the park's second wooden coaster. The owners originally wanted a coaster exactly like the Coney Island Cyclone, but space was limited, so the coaster would need to take up less space and would have sharper twists and turns. It became known as the Riverside Cyclone. In 1987, Riverside attempted to build a white-water rafting ride called the Lost River Water Ride. Plagued with problems, the attraction never opened and was subsequently abandoned. A majority of the ride was demolished in 1989 to make way for Wild River Falls, a waterslide complex consisting of three sets of slides: Riptide, Blue Lightning and Pipeline. A