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On the sign:
JAMES HENRY GREATHEAD 1844 - 1896 [relief of the Travelling Shield]
J.H. GREATHEAD CHIEF ENGINEER CITY AND SOUTH LONDON RAILWAY
INVENTOR OF THE TRAVELLING SHIELD THAT MADE POSSIBLE THE CUTTING OF THE TUNNELS OF LONDON’S DEEP LEVEL TUBE SYSTEM
The statue commemorates the engineer James Henry Greathead who invented the metal shield that made it possible to dig the London Underground. Its tube-like shape is why the London Underground is called the "Tube". The statue was placed in 1994 and was made by James Butler