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Line 1's signals system gets upgraded

    The 24-year-old signals system of Metro Line 1, which runs between Shanghai South Railway Station and Shanghai Railway Station, was upgraded in the early hours of Saturday.

    “The operation with the new system will be more stable, and the signal of the trains will be more accurate,” said Shi Cong, the Shanghai rail transit maintenance support team’s chief engineer of telecommunications and signals.

    “The departure interval between each train will be shortened from 160 seconds to 120 seconds.”

    The upgrade is a simple cutover that switched on the new system after the old system was powered off. The transition from the old telecommunications and signals system into a new one is called a cutover.

    The upgrading project took more than two years to prepare and process.

    “It took us more than two years to lay the cables of the new system in the tunnel of Line 1,” said Shi.

    “We had only two hours every night after Line 1 stopped its operation, but the total length of cable was 537,782 meters.”

    Fu Yu, deputy manager of the telecommunications and signals team, said the previous 6502 electric relay interlocking system had served Line 1 for about 24 years. “Its name came from the year it was designed — 1965,” said Fu.