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In page Victoria line:

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The line opened from Walthamstow Central to Highbury & Islington on 1 September 1968.[11][12] There was no opening ceremony; instead the normal timetable started.[11] The first train left Walthamstow Central for Highbury & Islington at 7:32 a.m. The line proved to be popular; more than 1,000 tickets were purchased at Highbury & Islington within its first hour of opening.[13]