page_title: Škoda 15 T
section_title: Bogies
hierarchical_section_title: Škoda 15 T / Design / Bogies
caption_attribution_description: Čeština: Praha, Střešovice. Den otevřených dveří Dopravního podniku ve vozovně Střešovice a Muzeu MHD. Tramvaj Škoda 15T ev. č. 9200. English: Střešovice, Prague, the Czech Republic. Open Doors Day in Střešovice tram depot and transport museum. Tram Škoda 15T. Camera location50°&#160;05′&#160;40″&#160;N, 14°&#160;23′&#160;20.3″&#160;E&#160;&#160;View this and other nearby images on: OpenStreetMap - Google Earth
context_page_description: Škoda 15T is a 100% low-floor multiple-unit tram developed by VUKV a.s. and built by Škoda Transportation in Pilsen for the Prague tram network. It was a successor to the Škoda 14 T, featuring articulated bogies and more power to correct for problems found during the operation of the 14 T. The 15T has articulated bogies at either end of the train, and Jacobs bogies between the segments. The tram has two double-doors in each segment to allow fast boarding of passengers, and one extra side door leading to the driver's cabin.
context_section_description: The fixed bogies which are used by most 100% low floor trams increase track wear and decrease the speed at which a tram can drive through a curve (usually 4–15 km/h (2–9 mph) on a 20 m (66 ft) radius curve). The 15T is designed to cope with these drawbacks by using Jacobs bogies under the articulations, and pivoting bogies at the ends of the tram.
  For a time the 15T was said to be the only 100% low floor tram in production with full-pivoting bogies. However, the Alstom Citadis X04, an experimental 100% low floor tram currently being developed with pivoting bogies (but with sections of high floor seating over the bogies), has made an initial production appearance in Istanbul as a modified Citadis 301 (with a fixed centre bogie), and as of 2015, a tram with a similar interior arrangement, and all pivoting bogies, is undergoing trials for Helsinki. With the same length of tramcar, the Škoda 15T also has four bogies, compared to three (fixed) bogies (the same as on most 100% low floor trams) on it its predecessor, the Škoda 14 T's, which decreases the load each wheel puts on the track. Most of the tram floor is 350 mm (13.78 in) above the rails, but the height over the bogies is 450 mm (17.72 in) above the rails. The transition is inclined, without interior steps. The corridor above the central bogies is 700 mm (27.56 in) wide.
  The bogies can all be driven, or some may be idle, depending on the customer's preferences. The bogies have two axles and two-level springing. The mounted wheels are rubber-sprung, with integrated brake-discs and axle bearings. On the axle bearings there is a combined, dynamically resistant, primary rubber-bonded-metal-sprung bogie framework. This framework supports four traction motors and one (in outer bogies) or two (in inner bogies) sprung swing bolsters. The secondary springing of the swing bolsters is secured by steel coil springs with parallel hydraulic rotating dampers. The swing bolsters have pivot bearings, which facilitate full rotation of the bogie below the body without any limitations.
caption: Detail of pivoting bogie
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