Train Automatic Stopping Controller
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.
- Tokyo Metro Ginza Line
- Tokyo Metro Marunouchi Line (Main line converted to ATO in 2010, Hōnanchō branch continues to use TASC)
- Tōkyū Meguro Line
- Tōkyū Ikegami Line
- Tōkyū Tamagawa Line
- Aonami Line
- Osaka Municipal Subway Imazatosuji Line
- Seibu Yūrakuchō Line (at Kotake-mukaihara Station)
- Keihan Keishin Line (at Misasagi Station)
- TASC article by Toshihiko Itō (click on 定位置停止装置について)