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Arrival notices err, Metro concedes
By Zha Minjie |
June 8, 2010, Tuesday
|
Print Edition
Print Edition
YES, commuters, Metro's management does know some arrival-time broadcasts have been inaccurate lately. They're asking you to be patient.
Metro authorities yesterday conceded the increasingly obvious: the subway timing system on the screens at some Metro stops has been awry.
The mistiming has been most noticeable at new subway stretches, authorities said, such as the new extensions to the city's two airports.
In these cases, trial runs are mixing with heavy World Expo traffic. Metro managers said they need some time to iron out the problem.
As officials explained it, the subways use a signal system called Automatic Train Supervision to detect the distance between two trains. The system uses the distance to calculate the actual interval time among stops. The interval time may change. When that happens, the updated arrival time may lag.
Metro authorities yesterday conceded the increasingly obvious: the subway timing system on the screens at some Metro stops has been awry.
The mistiming has been most noticeable at new subway stretches, authorities said, such as the new extensions to the city's two airports.
In these cases, trial runs are mixing with heavy World Expo traffic. Metro managers said they need some time to iron out the problem.
As officials explained it, the subways use a signal system called Automatic Train Supervision to detect the distance between two trains. The system uses the distance to calculate the actual interval time among stops. The interval time may change. When that happens, the updated arrival time may lag.
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