AS N

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original ALS cab signaling of a VL60PK electric locomotive
more modern driver's cab signaling of a subway with ALS-ARS

ALSN (continuous automatic train signaling, Russian Автоматическая Локомотивная Сигнализация Непрерывного действия, АЛСН ; transcription Awtomatitscheskaja Lokomotiwnaja Signalisazija Neprerywnowo deistwija ) is an automatic train control system, the on main lines in the countries of the former Soviet Union , z. B. is installed in Lithuania , Estonia , the Russian Federation and Belarus . The extended ALS-EN variant, which works with double carrier frequencies, is installed on high-speed lines. The more modern train control systems with KLUB-U cab signaling are still equipped with sensors for the ALSN / ALS-EN line equipment.

classification

The designation ALSN is composed of ALS literally "Automatic Locomotive Signaling" ( Russian автоматическая локомотивная сигнализация, АЛС ) and the variant N for “Continuous Action, ” ( Russian Непреврыво ). Other variations in the same way are ALST ( АЛСТ ) for "Automatic Spot locomotive signaling" ( автоматическая локомотивная сигнализация точечного действия ) and ALSR ( АЛСР ) for "Automatic Radio-controlled locomotive signaling" ( автоматическая локомотивная сигнализация с использованием радиоканала ). The term ALS-ARS ( АЛС-АРС ) refers to "Automatic locomotive signaling with automatic speed control" ( автоматическая локомотивная сигнализация с автоматическим регулированием скорости ) for systems in automated driving .

functionality

ALSN comprises driver's cab signaling and the automatic train braking system. The system is based on coded track circuits . These are conventionally built with relay technology.

The data transmission to the train takes place with 50, 25 or 75  Hz carrier frequency and numerical coding. Four signaling terms - 3 codes and no code - are transmitted to the vehicle.

The driver is shown:

  • Acoustic notification in the event of a code change to a more restrictive code
  • Aspect of the vehicle-side signal , according to the code received

Be monitored:

  • Acknowledgment of the absence of a code every 40-90 seconds
  • Confirmation of a more restrictive code by the driver within 15  seconds
  • Continuous speed monitoring after crossing a line signal indicating a stop

An emergency brake is triggered in the following cases:

  • Audible warning was not confirmed by the driver
  • Driving over a route signal indicating a stop
  • Exceeding the speed value specified by the relevant signal

With regard to ETCS , ALSN is managed as a Class B system .

See also