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In the early days of railways in Sweden, locomotives and carriages were purchased from Britain, and the first signalling reflected British practice. The first signalling rule book was bilingual, written in both Swedish and English. British capital had been used in building some of the railways, and the first locomotive drivers were British.

Initial signalling was basic, consisting of just two signal arms on the same post at each station. As interlocking developed, the typical European practice of controlling operations centrally from the station developed, using various types of frames to operate the signalling on the double-wire system.

The later semaphore signals did have common features with the signalling in Germany (used by several European countries) but Swedish signalling had significantly different principles of operation.

Power signalling came early to Sweden, as did electrification of the railway. Hardly any semaphore signalling survives.

Additional notes by Per Olofsson