mainly by trolleybuses and accompanied by buses servicing the neighbouring villages. There are four trolleybus lines and four bus lines in operation. The town council have proposed scrapping the trolleybus system in Mariánské Lázně several times since the late 1990s, claiming high network maintenance costs. Mariánské Lázně is one of the smallest towns in the world to operate a trolleybus system. Sport Mariánské Lázně has a motorcycle racing circuit. The venue, Speedway Longtrack, has hosted six Long Track World Champion finals and five rounds of Grand-Prix racing. The town is known for the Royal Golf Club Mariánské Lázně. Sights Mineral springs and colonnades The top attraction of the town is its 100 mineral springs (53 of them are tapped) with high carbon dioxide content and often also higher iron content, both in the town itself (40 springs) and its surroundings. The water in the springs has an average temperature of 7-10 °C, and is formed through interactions with the deep fault lines that run under the region. The mineral water is claimed to cure disorders of the kidneys and of the urinary tract, respiratory disorders, locomotive system disorders, metabolic disorders, oncological disorders and gynaecological disorders, including the treatment of sterility. Many of the springs have pavilions and colonnades built around them. Among them are: Křížový pramen (Cross Spring) – a monumental pavilion with a cupola bearing a patriarchal cross and 72 Ionic columns was built over the spring in 1818–1826. Today's concrete building is a copy from 1911–1912, originally it was a light wooden and brick construction. The water from the spring is highly mineralized with a strong laxative effect, and has been used for both curative drinks and baths. Rudolfův pramen (Rudolph's Spring) – with a wooden pavilion built over the spring, some water is tapped and piped to the nearby colonnade and some is bottled. Its water is weakly mineralized with high calcium content and has been used to cure urinary problems. Karolinin pramen (Caroline's Spring) – named after the wife of the Emperor Francis I, Caroline Augusta. The nearby colonnade was built in 1869, the pavilion is a reconstruction from 1989. The water is weakly mineralized, with higher magnesium content. Ferdinandův pramen (Ferdinand's Spring) – the water from the spring, similar in composition to Křížový pramen, is bottled under the Excelsior label. Ambrožovy prameny (Ambrose's Springs) Lesní pramen (Forest Spring) Zpívající fontána (Singing Fountain) The total yield