Punktförmige Zugbeeinflussung

PZB or Indusi is an intermittent cab signalling system and train protection system used in Germany, Austria, Slovenia, Croatia, Romania, Israel, Serbia, on two lines in Hungary, on the Tyne and Wear Metro in the UK, and formerly on the Trillium Line in Canada.

"PZB" redirects here. For the airport in South Africa, see Pietermaritzburg Airport.

Developed in Germany, the historic short name Indusi was derived from German Induktive Zugsicherung ("inductive train protection"). Later generations of the system were named PZB (short for German Punktförmige Zugbeeinflussung, literally "punctiform train influencing", translated as "intermittent train protection" or officially "intermittent automatic train running control"), highlighting that the PZB/Indusi system is a family of intermittent train control systems, in comparison with the continuous train control systems including LZB (German Linienzugbeeinflussung, literally "linear train influencing") that were introduced at the time.

Originally, Indusi provided warnings and enforced braking only if the warning was not acknowledged (similar to traditional automatic train stop). The later PZB systems provide more enforcement, relying on a train computer.

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