ALSN is a train control system used widely on the main lines of the ex-Soviet states. 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 of the carrier wave.

On IJR

No public IJR answers mention ALSN yet. As people ask about it and share their answers, they'll appear here.

Facts from Wikidata (CC0).