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On the sign:
THIS STONE WAS LAID BY THE RT HON LORD ABERCONWAY P.C. CHAIRMAN OF THE METROPOLITAN RAILWAY COMPANY 24 JULY 1912
R.H SELBIE GENERAL MANAGER W.WILLOX M.I.C.E ENGINEER
Beneath this roadway runs the world’s first underground passenger railway. It was opened for public traffic by the Metropolitan Railway Company on 10 January 1863. [Transport for London logo] ERECTED BY LONDON TRANSPORT IN 1963