Invensys Rail Group was a division of Invensys, a UK-based multinational engineering company. It was a designer, manufacturer and integrator of railway equipment, including automation, signalling and controls. The group was headquartered in Chippenham, Wiltshire, and as of 2005[update], had over 2750 employees in 14 locations internationally. It operated through four companies:
Invensys Rail Dimetronic (Spain, Portugal and Latin America);
The other part of Westinghouse Brake and Signal Company, Westinghouse Brakes Ltd, was sold by Invensys to Knorr-Bremse, and has since left the Chippenham site to set up in the nearby town of Melksham.
On 28 November 2012, Invensys agreed to sell its rail arm to Siemens AG for £1.7bn; the sale was completed 2nd May 2013.