SPIES in the sky will soon be pinpointing problems from leaves on Oxfordshire's Rail lines, writes Chris Koenig.

The new system, which will be pioneered by Thames Trains, uses global positioning satellites to pinpoint exactly where falling leaves are likely to cause delay or danger.

AEA Technology's Low Adhesion Warning System relies on on-board computers to monitor a train's wheel spin.

When the train encounters low adhesion, a message is automatically transmitted by mobile phone and satellite to a central control room.

Armed with this information the system produces a colour-coded map showing problem areas. This can be used to keep drivers up to date on the situation and to help teams clear up the leaves.

The problem of leaves on the line can be dealt with by putting Sandite on the track or cutting back vegetation beside the track.

The difficulty has always been in obtaining accurate information on the location and severity of low adhesion sites.

Every autumn falling leaves cause long delays for passengers. And in extreme cases, wheels slipping on lines pose a serious safety risk, as highlighted by the collision at Slough station in 1994.

AEA Technology Rail was launched yesterday following the integration of BR Research into AEA Technology.

The Derby-based company, which has a 270-strong staff, operates in 31 countries worldwide. It has expertise in enhancing railway performance, from track design to analysing noise.

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