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In page Katoomba, New South Wales:

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Other attractions include Scenic World, a tourist complex in the southwest of the town. This site is home to the steepest funicular railway in the world, the Katoomba Scenic Railway, which was originally built to facilitate coal and oil shale mining in the Jamison Valley.[4] Scenic World also offers the Scenic Skyway cable car, which travels over an arm of the Jamison Valley and offers views of Katoomba Falls and Orphan Rock. In 2004 the original Skyway car was replaced by a new car with a liquid crystal panel floor, which becomes transparent while the car travels. In 1983 construction began at the site on a roller coaster called the Orphan Rocker; the track was completed, but this attraction has never been opened to the public.[citation needed]