Fiber Optic Sensing (FOS) enables continuous, real-time monitoring using standard optical fibers along the track. The resulting vibrations are captured with high spatial resolution and analyzed. Armoured cables, such as Double-Insulated Super Armoured Cable (DI-SAC), use steel-wire armor and fire-retardant sheaths for high mechanical protection. We monitor track condition, detect trespass and cable security events, and alert operators to natural hazards such as landslides or rock falls. Using digital twins, AI, and machine learning, railway data is turned into a multitude of insights, including track condition monitoring. Distributed acoustic sensing can be used to analyze vibrations in fiber optic cables alongside railway tracks to detect infrastructure problems, such as faulty sound barriers lining the tracks. This article is part of our exclusive IEEE Journal Watch series in partnership with IEEE Xplore. The sensing technique, known as distributed acoustic/vibration sensing (DAS/DVS), relies on the effect of Rayleigh scattering.
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