Alstom to supply signalling system for Circle Line Stage 6, Singapore November 16, 2017 | Asia Pacific Company News Alstom has secured a contract from the Land Transport Authority (LTA) to supply the signalling system for the mass rapid transit (MRT) Circle Line (CCL) Stage 6 in Singapore. The scope of work ... This content is available to only subscribers. Username or E-mail Password Remember Me Forgot Password