Ironically, by this point, the migration of port facilities downstream to the deeper waters of the Firth of Clyde and improvements in engineering technology had allowed the consideration of bridges downstream of the city centre, namely the Kingston Bridge and, much further downstream than the Tunnel, the Erskine Bridge.
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In the 1960s, it produced cast-iron rings to line the Tyne Tunnel under the River Tyne from Jarrow to Howdon and the Clyde Tunnel under the River Clyde from Whiteinch to Govan near Glasgow.
These projections of the Clyde Tunnel, Kingston Bridge and Erskine Bridge expand into aerial perspectives of the Firth of Clyde and Loch Lomond as Jim Kerr sings "higher and higher" while the camera 'takes off'.