The 7 was the last New York City Subway line to have its countdown clocks turned on; they were briefly enabled on December 31st, 2017 before being taken offline and re-enabled on January 2nd, 2018.
Unlike the rest of the IRT (numbered) lines, the 7’s countdown clocks are LCD screens and display arrivals in a similar fashion to countdown clocks on the BMT/IND (lettered) lines.
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