The Beijing Metro Line 4 is 28.18km long, linking 23 underground stations and one above-ground station. Under the contract, Alcatel will deploy its advanced SelTrac S40 radio CBTC solution to the new mass transit line.
The CBTC signalling system provides moving-block technology to allow safe operation of trains with closer separation, as well as fully automated central control. These features allow high capacity for service frequency and efficiency, as well as flexible fleet operations.
Operating data is transmitted between train and trackside equipment via an open-standards radio and WLAN system.