The stations were:
The Palace Gates line was closed to passengers on 7 January 1963. Goods services continued to run until 5 October 1964.
The 2015 proposed route for Crossrail 2, sees an option that would closely resemble the Palace Gates Line, running from Seven Sisters/South Tottenham railway station (double-ended station) through either Turnpike Lane and Alexandra Palace stations, or Wood Green Underground station, on its way to New Southgate railway station.
The Wikipedia page is