At the Dutch Railways, we are collecting 10s of billions sensor measurements coming from the train fleet and railroad every year. We use these data to conduct predictive maintenance, such as predicting failure of the train axle bearings and detecting air leakage in the train braking pipes. This is extremely useful, as these failures are notoriously difficult to detect during regular maintenance, while occurring frequently and causing severe delays, damage to material and reputy, and costs.

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Source: NDT