CASE STUDY : Shanghai Metro 1 Shanghai Metro is a massive citywide public transportation system with a total of 10 urban rail lines, including those under trials currently deployed. These are Metro Lines 1, 2, 3, 4, 5, 6, 7, 8, 9 and 11. On average, more than 3.5 million commuters travel daily on the metro, with peak traffic volume reaching up to 5.27 million in end 2009. Shanghai Metro currently spans 390 kilometres of track, and will reach up to 420 kilometres by the time the World Expo takes place in Shanghai mid 2010. In 2012, the metro system will exceed over 500 kilometres of track and will grow to an estimated total of 22 lines before 2020. To manage this complex rail system, Shanghai Metro turned to a TETRA (TErrestrial Trunked RAdio) digital trunking solution for its wire

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