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On the sign:
THE GROVE BRIDGE
THIS PLAQUE WAS UNVEILED BY THE HON. W. H. MCALPINE. CHAIRMAN, RAILWAY HERITAGE TRUST, ON 16th SEPTEMBER 1987 TO COMMEMORATE THE RESTORATION OF THE GROVE BRIDGE, WATFORD THE PROJECT WAS SPONSORED BY BRITISH RAIL PROPERTY BOARD BRITISH WATERWAYS BOARD RAILWAY HERITAGE TRUST