Bombardier wins contract for signalling upgrade of LU in UK; submits bid to renew Bucharest metro trains June 16, 2011 | Europe News Bombardier Transportation has secured a contract for the Sub-Surface Railway (SSR) automatic train control (ATC) signalling upgrade for London Underground (LU) from the UK’s Department for Transport (... This content is available to only subscribers. Username or E-mail Password Remember Me Forgot Password