Measurement of vertical and longitudinal rail displacements using digital image correlation

Excessive rail displacements can result in reduced rail traffic speeds and increased risk of derailments. A number of methods exist for the measurement of vertical rail displacements, including using geophones, high-speed cameras, and rail vehicle mounted systems. The advantage of rail vehicle mounted methods is that large lengths of track can be assessed. However, there are some instances where the measurement of absolute rail deformations is essential, particularly in poor subgrade conditions where significant long-term settlements are possible. Vehicle-mounted monitoring strategies cannot capture the so-called “running rail” phenomena, where the passage of a train can push the rails longitudinally. Monitoring rail displacements using digital image correlation (DIC) has the potential to capture both of these phenomena unlike other technologies. The objectives of this paper are to evaluate the use of a system of synchronized high-speed cameras to measure absolute longitudinal and vertical rail displaceme...

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