Passenger Tunnel Linings At Waterloo Underground Station
This pictures show the cast-iron pedestrian tunnel linings at Waterloo tube station.
The Jubilee Line opened in 1999.
In the last few years, concrete has been able to be 3D-printed, so it can now be produced in different shapes.
All these wall and roof panels on the Elizabeth Line were made by 3D-printing of concrete.
Conclusion
Design has progressed in 25 years.
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