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Okay. Blame basement developments and homeowners suddenly becoming vocal about ground borne vibrations.
In the past 20years; not the 1900s.
People dig down to build a cinema room, don’t enjoy the ground borne vibrations from the Tube.
Complain and instruct expensive lawyers.
TfL/LU come up with a solution to reduce these vibrations. Except energy cannot be created nor destroyed so shall still manifest… in the form of carriage noise.
There’s a lot more to it than that, but that’s the crux.
In the early 1900s?