Train automatic stopping controller

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TASC unit beneath a Tōkyū 7000 series EMU
TASC transponders at a railway station in Japan

A train automatic stopping controller (TASC), also known as a position stopping device (定位置停止装置?), is a train protection system used only in Japan. It allows trains equipped with TASC to stop automatically at stations without the need to operate the brakes manually.

TASC was originally developed in the 1950s and the 1960s as a way of ensuring that trains stop properly at stations, especially if the driver has made a minor driving lapse and stopped with a slight overrun/underrun, which can prove to be an inconvenience for passengers, particularly if the first or last door is partially (or, in rare cases, completely) outside the station. It has also been useful at preventing SPADs. TASC is also compatible with automatic train operation (ATO) and automatic train control (ATC).


The TASC system is used on the following lines.

In addition, the JR East Yamanote Line is expected to be TASC-ready by 2017.

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