The MTA is shutting down its popular countdown clocks on the 1, 2, 3, 4, 5 and 6 lines.
They're the clocks over the subway platform that show the wait until the next train arrives.
They're being taken off-line Saturday for system maintenance, from 7 a.m. to 7 p.m.
The clocks have been installed at over 150 stations.
There will be no effect to the countdown clocks on the L or 7 lines.
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