North London line then it was switched to . Later, it was cut back to . A tunnel, the Hampstead Heath tunnel, runs under Hampstead between and . The line is double track throughout, with a mix of triple and quadruple track between and . The former North Woolwich branch included a section of single track between Custom House and North Woolwich stations, and the Broad Street branch was at one time formed of quadruple track. During the February–May 2010 blockade, the , and stations were rebuilt to allow the extended East London line to serve Highbury & Islington on fully segregated tracks
The Double Hook hook twice the fear." Watson wrote "The Double Hook" between 1952 and 1954 in Calgary, Alberta and revised it during a year spent in Paris. Throughout the 1950s she was unable to find a publisher. "T.S. Eliot at Faber & Faber, C. Day-Lewis at Chatto & Windus, and Rupert Hart-Davis all turned it down." McClelland & Stewart optioned the book in Canada, largely on the strength of a covering letter by Fred Salter of the University of Alberta calling it "the most brilliant piece of fiction ever written in Canada." To decide on publication, though, the company sought the opinion