A £413m programme to improve rail signalling systems and reduce trains delays has been unveiled (link below.)
http://www.rmtbristol.org.uk/2006/10/rail_signalling_gets_413m_boos.html#more

Network Rail says the three-year scheme will form part of a long-term £2bn plan to overhaul signalling.

The government and rail regulator have yet to approve Network Rail's programme which would be spread across the next five to eight years.

Also , Westinghouse Rail Systems , based in Chippenham , said it has been awarded a national framework agreement by Network Rail , which includes the supply of Type A signalling projects in Scotland , the East Midlands and the West Midlands (links below.)
http://www.westsig.co.uk/News.aspx?item=46
http://www.westsig.co.uk/PageBase.aspx?puid=1
http://www.westsig.co.uk/Project.aspx?puid=17

Previously Westinghouse Rail Systems was a division of Westinghouse Brake and Signal Company Ltd before being split into separate companies - Westinghouse Signals and Westinghouse Brakes Ltd. Invensys sold Westinghouse Brakes to Knorr-Bremse in April 2000.

Knorr-Bremse is based at Hampton Park East , Melksham (links below.)
http://archive.thisiswiltshire.co.uk/2005/7/8/82717.html
http://www.railway-technology.com/contractors/brakes/westinghouse_brakes/