page_title: Linienzugbeeinflussung
section_title: Entry into LZB, zones and addressing
hierarchical_section_title: Linienzugbeeinflussung / Operation / Entry into LZB, zones and addressing
caption_attribution_description: Beschreibung: LZB-Topologie Herkunft: Selbst gezeichnet Autor: SteveK 22:33, 25. Aug 2005 (CEST)
context_page_description: Linienzugbeeinflussung is a cab signalling and train protection system used on selected German and Austrian railway lines as well as on the AVE and some commuter rail lines in Spain. The system was mandatory where trains were allowed to exceed speeds of 160 km/h in Germany and 220 km/h in Spain. It is also used on some slower railway and urban rapid transit lines to increase capacity. The German Linienzugbeeinflussung translates to continuous train control, literally: linear train influencing. It is also called linienförmige Zugbeeinflussung.
  LZB is deprecated and will be replaced with European Train Control System between 2023 and 2030. It is referenced by European Union Agency for Railways as a Class B train protection system in National Train Control. Driving cars mostly have to replace classical control logic to ETCS Onboard Units with common Driver Machine Interface. Because high performance trains are often not scrapped or reused on second order lines, special Specific Transmission Modules for LZB were developed for further support of LZB installation.
context_section_description: Before entering an LZB controlled section the driver must enable the train by entering the required information on the Driver Input Unit and enabling LZB. When enabled the train will light a "B" light.
  A controlled section of track is divided into up to 127 zones, each 100 m (328 ft) long. The zones are consecutively numbered, counting up from 1 in one direction and down from 255 in the opposite.
  When a train enters a LZB controlled section of track, it will normally pass over a fixed loop that transmits a "change of section identification" (BKW) telegram. This telegram indicates to the train the section identification number as well as the starting zone, either 1 or 255. The train sends back an acknowledgement telegram. At that time the LZB indications are switched on, including the "Ü" light to indicate that LZB is running.
  From that point on the train's location is used to identify a train. When a train enters a new zone it sends a response telegram with the "vehicle location acknowledgement" filed indicating that it has advanced into a new zone. The central controller will then use the new zone when addressing the train in the future. Thus a trains address will gradually increase or decrease, depending on its direction, as it travels along the track. A train identifies that it has entered a new zone by either detecting the cable transposition point in the cable or when it has traveled 100 metres (328 ft). A train can miss detecting up to 3 transposition points and still remain under LZB control.
  The procedure for entering LZB controlled track is repeated when a train transitions from one controlled section to another. The train receives a new "change of section identification" telegram and gets a new address.
  Until the train knows its address it will ignore any telegrams received. Thus, if a train doesn't properly enter into the controlled section it won't be under LZB control until the next section.
caption: LZB Topology
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