Case Study: Ballast Renewal in Friesland, Netherlands

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Friesland Rail, Netherlands

Ballast Renewal – Filtration and Confinement

The Spitze ballast-cleaning train is used extensively to deal with contaminated ballast. Running at 3m/s, the train lifts a length of the track, extracts, then washes and replaces the ballast. The track is then lowered back in to place.

This exercise is also a good opportunity to deploy a geosynthetic to combat the contamination problem and extend the maintenance interval. On this occasion, RK4 – a textile/grid composite, was installed to stabilise the ballast/subgrade interface and reduce the upward movement of subgrade fines.

Using the 30m long by 3.2m wide composite, avoided the complication of controlling two separate products and the result was a faster installation.

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