Requirement In 2009, Signalling Integrators CASCO, HollySys and CRSC Metro were re- spectively awarded contracts to supply efficient and reliable signalling sys- tem to Yizhuang Line, Changping Line (suburban lines) and Beijing Line 8 (urban line). CBTC signalling systems were used on all lines with SIL4 certifi- cated axle counters mandated as back up. As of August 2012, approximate- ly 80km had been opened. Solution For all projects, the ACS2000 with IMC and RSR180 was chosen by the three signalling operators and a total of 441 wheel sensors across 355 counting sections were supplied and installed both efficiently and well within the pro- ject timescales. Benefit Due to specific requirements of these projects, during the first opening year, the signalling systems were operated unde

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