<P> Talgo trains are best known for their unconventional articulated railway passenger car that uses a type similar to the Jacobs bogie that Talgo patented in 1941, similar to the Robert Stephenson and Company trains . The wheels are mounted in pairs but not joined by an axle and the bogies are shared between coaches rather than underneath individual coaches . This allows a railway car to take a turn at higher speed with less swaying . As the coaches are not mounted directly onto wheel bogies, the coaches are more easily insulated from track noise . Talgo trains fitted with variable gauge axles can change rail gauge - for instance at the 1,668 mm Iberian gauge / 1,435 mm standard gauge at the Spanish - French border interchange . </P> <P> Since the introduction of the Talgo Pendular in 1980, the train tilts naturally inwards on curves, allowing it to run faster on curves without causing discomfort to passengers . The carriage tilting system pivots around the top of the suspension columns, which has the effect of partially cancelling out the effects of the lateral acceleration when cornering . </P> <P> Talgo trains are divided into a number of generations . They come in both locomotive hauled and self - propelled versions . </P> <P> The Talgo I was built in 1942 in Spain . The coaches were built at the "Hijos de Juan Garay" workshop in Oñati and the locomotive was built at the workshops of the "Compañia de Norte" in Valladolid . It was built as a prototype, and it was used to set several railroad speed records . The first test run occurred between Madrid and Guadalajara, Castile - La Mancha in October 1942 . </P>

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