Marconi Provides Mission-Critical Network for Heathrow Airport's Terminal 5 People Mover Project Bombardier relies on Marconi's proven communications networks and installation services for expansion at one of world's busiest airports PITTSBURGH, May 31 /PRNewswire-FirstCall/ -- Marconi Corporation plc (LONDON: MONI and Nasdaq: MRCIY) today announced that Bombardier Transportation will use Marconi's data networking equipment and services to handle mission critical train control data for Automated People Mover (APM) at BAA Heathrow's Terminal 5 project. Construction of Heathrow T5 will expand capacity at Heathrow, already one of the world's busiest airports, to accommodate another 30 million passengers a year. Bombardier and Marconi are also partnered to deliver a similar, comprehensive train-control data network for the Dallas/Fort Worth International Airport in 2005. At Heathrow, Marconi will provide Bombardier with a scalable, digital network for command and control of the APM -- a driverless train for transferring passengers between the main terminal and outlying buildings using a dedicated underground track. Marconi's services include a fully integrated turnkey communications system, combining a mission- critical, multiservice network with installation and training. "Marconi's expertise in designing, building and servicing mission-critical communications networks is proven in the most demanding environments around the world, including national defense and emergencies, transportation command and control, and security and surveillance applications," said Geoff Doy, CEO of Marconi's Data Networks division that is supplying the network and ongoing services. "Key features of Marconi's communications networks are flexibility and ease of expansion, which improve long-term investment returns and make them well-suited for the new packet-based applications of next-generation networks." About the T5 Project T5 will add passenger handling capacity of between 30 million and 35 million passengers a year at Heathrow. Phase 1 of the project, which includes the main terminal building and one satellite building is due for completion in March 2008. Phase 2, which includes the second satellite building, is scheduled for completion in 2011. About Marconi Corporation plc Marconi Corporation plc is a global telecommunications equipment, services and solutions company. The company's core business is the provision of innovative and reliable optical networks, broadband routing and switching, broadband access technologies and services. The company's customer base includes many of the world's largest telecommunications operators. The company is listed on the London Stock Exchange under the symbol MONI and on NASDAQ under the ticker MRCIY. Additional information about Marconi Corporation can be found at http://www.marconi.com/ . All brands or product names are trademarks of their respective holders. This press release contains forward-looking statements with respect to products, partners, customers, future growth and other matters. Please refer to the Form 10-K report filed by Marconi Corporation plc with the United States Securities and Exchange Commission for a discussion of risks that could cause actual results to differ materially from such statements. DATASOURCE: Marconi Corporation plc CONTACT: Press, Joseph Ferrara, +1-724-742-7740, or , or Investors, Karen Keyes, +44-207-306-1345, or , or Industry Analyst, Colleen Rosander, +1-724-742-7794, or , all of Marconi Corporation plc Web site: http://www.marconi.com/

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