ALSN
Encyclopedia
ALSN is a train control system meaning Continuous Automatic Train Signalling used widely on the main lines of the ex-Soviet states (Russian Federation, Ukraine, Belarus, Latvia, Lithuania, Estonia). It uses modulated pulses inducted into rails similar to the Italian RS4 Codici
and American Pulse Code Cab Signaling
. On high-speed lines the variant ALS-EN (АЛС-ЕН) is used which takes advantage of a double phase difference modulation carrier frequency.
The name ALSN (АЛСН - автоматична локомотивна сигналізація непрерывного действия) is composed of ALS, literally "Automatic Locomotive Signalling" (АЛС - автоматична локомотивна сигналізація) and the variant designation N "Continuous Effect" (Н - Непрерывного действия). Other variants are built according to the same scheme like ALST (АЛСТ) for "Fixed Point Automatic Train Signalling" (автоматична локомотивна сигналізація точечную действия) and ALSR (АЛСР) for "Radio-Based Automatic Train Signalling" (автоматическая локомотивная сигнализация с использованием радиоканала). The term ALS-ARS (АЛС-АРС) refers to "Automatic Train Signalling with Automatic Speed Regulation" (автоматическая локомотивная сигнализация с автоматическим регулированием скорости) usually known in English as an automatic train operation
system.
The system makes use of pulses at 0, 25, 50 and 75 ppm. Extensions in the ALS-ARS automatic train operation system encode with 75, 125, 175, 225, 275 ppm. The common carrier frequency is 50 Hz but in some areas a 25 Hz frequency is used. Those tracks are marked as ALS-25 (АЛС-25) lines .
Since the 1990s, the Russian Railroad Company has introduced the computerized successor system KLUB-U
which requires ALSN / ALS-EN sensors for compatibility. In ERTMS the ALSN/ALS-EN systems are listed as ETCS Class-B systems.
RS4 Codici
RS4 Codici is a train protection system used in Italy. The term is an abbreviation of Ripetizione Segnali a 4 codici ....
and American Pulse Code Cab Signaling
Pulse code cab signaling
Pulse code cab signaling is a form of cab signaling developed in the United States by the Union Switch and Signal corporation for the Pennsylvania Railroad in the 1920s...
. On high-speed lines the variant ALS-EN (АЛС-ЕН) is used which takes advantage of a double phase difference modulation carrier frequency.
The name ALSN (АЛСН - автоматична локомотивна сигналізація непрерывного действия) is composed of ALS, literally "Automatic Locomotive Signalling" (АЛС - автоматична локомотивна сигналізація) and the variant designation N "Continuous Effect" (Н - Непрерывного действия). Other variants are built according to the same scheme like ALST (АЛСТ) for "Fixed Point Automatic Train Signalling" (автоматична локомотивна сигналізація точечную действия) and ALSR (АЛСР) for "Radio-Based Automatic Train Signalling" (автоматическая локомотивная сигнализация с использованием радиоканала). The term ALS-ARS (АЛС-АРС) refers to "Automatic Train Signalling with Automatic Speed Regulation" (автоматическая локомотивная сигнализация с автоматическим регулированием скорости) usually known in English as an automatic train operation
Automatic train operation
Automatic train operation ensures partial or complete automatic train piloting and driverless functions.Most systems elect to maintain a driver to mitigate risks associated with failures or emergencies....
system.
The system makes use of pulses at 0, 25, 50 and 75 ppm. Extensions in the ALS-ARS automatic train operation system encode with 75, 125, 175, 225, 275 ppm. The common carrier frequency is 50 Hz but in some areas a 25 Hz frequency is used. Those tracks are marked as ALS-25 (АЛС-25) lines .
Since the 1990s, the Russian Railroad Company has introduced the computerized successor system KLUB-U
KLUB-U
KLUB is the name of the modern Russian train control systems. The abbreviation "КЛУБ" stands for "Комплексное локомотивное устройство безопасности", Integrated Train Protection System...
which requires ALSN / ALS-EN sensors for compatibility. In ERTMS the ALSN/ALS-EN systems are listed as ETCS Class-B systems.