Adelsö

Adelsö is an island in the middle of Lake Mälaren in Sweden, near southern and northern Björkfjärden. The administrative center of the important settlement Birka (on the neighbouring island Björkö) was situated at Hovgården on Adelsö.

Geography

The Adelsö landscape consists of pine-clad rocky hills and moraine ridges dotted with fields and deciduous trees, mainly oak. The highest spot on Adelsö is Kunsta Mountain, which is 53.2 m above sea level. The top of Kunsta has an outlook tower offering a great view of the middle of Lake Mälaren.

Demographics

Adelsö has about 700 permanent residents, a number that has been quite stable throughout the centuries. Many residents commute to jobs in Stockholm, but there are also farmers and fishermen. During the summer months, the island is popular with tourists.

Transportation

Transportation to Adelsö is very good. Buses (lines 311 and 312) run from the bus terminal at Brommaplan in the middle of Bromma, to Sjöängen on Munsö. From here, the Adelson Ferry, a vehicular cable ferry crosses to Adelsö. Bus 312 travels on the ferry and traverses the whole island. The ferry runs every half hour during the day and hourly during evenings and nights. The night ferry runs less frequently during the summer months.

ALSN

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 of the carrier wave.

The name ALSN (АЛСН - автоматическая локомотивная сигнализация непрерывного действия) is composed of ALS, literally "Automatic Locomotive Signalling" (АЛС - автоматическая локомотивная сигнализация) 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" (АЛС точечного действия) and ALSR (АЛСР) for "Radio-Based Automatic Train Signalling" (АЛС 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) used in subways which is a form of an automatic train control system.