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Zac Ellis Knapp (c.1867-1926)
1926 Obituary 
"WE regret to have to record the death on Friday of last week, October 1st, of Mr. Zac Ellis Knapp, director of construction to the Metropolitan District, London Electric, City and South London, and Central London Railway Companies. Mr. Knapp was born fifty-nine years ago and came to this country from America in 1901 to take up a position with the Underground Railways. In 1910 he was appointed general manager of the London United Tramways, and in 1913 returned to the Underground Railway as chief engineer.
In 1915 he became manager for maintenance and construction, and from March, 1917, to November, 1918, acted as general manager of the Associated Equipment Co, at the time executing Government contracts for lorries, shells, and other munitions. Immediately after the Armistice he resumed his post as manager for maintenance and construction with the Underground Railways, and for a short time served as commercial manager as well.
In 1921 he became director of construction, and in that post was responsible for the extension of the London Electric Railway from Golders Green to Edgware, the reconstruction of the City and South London Railway by the enlargement of its tunnels, the extension of that railway to Morden, and the extension of the Hampstead section of the London Electric Railway from Charing Cross to Kennington."