| Rail Monitoring |  | Rockfall Monitoring |
Trains running on railway lines that pass alongside a rock slope or cliff face can be at risk from falling rocks, with speed restrictions imposed as a result. At one location, Strainstall installed a rockfall monitoring system to rock netting installed over the cliff face to hold the rocks in place. The vertical cables are each instrumented with a load shackle and an accelerometer, which in turn are connected to a datalogger. The accelerometer is used to detect any vibration in the netting, which alerts the system to a potential rockfall. The load on the shackle responds to increased load in the vertical restraint cables, confirming whether or not the netting is supporting a new rockfall and the magnitude of the load.
The dataloggers are linked to site computer, which is linked to the Signal Panel via 
broadband. This enables the signallers to see when a rockfall has occurred, allowing them to take the appropriate actions. The rockfall monitoring system means that temporary speed restrictions or line closures are only imposed when there is a measurable risk to trains, as opposed to blanket restrictions.
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