Optical fibre telecommunication with fail safe transmission for railway utility

Today´s general demands to railway administrations all over the world are: improved traffic regularity, more frequent departures and shorter travelling times. In order to meet above demands it is paramount to expand the existing transmission capacity for telecommunication and to implement more flexible signal interlocking systems. The authors describe the advantages gained by railway administration from applying optical fibre telecommunication together with failsafe transmission for line block systems. Futhermore, the authors present projects in Denmark and India using the new technologies