It is remarkably hard to find information on a great engineering feat of the early 20th century. The land Paris sits on is awful for building on – some of it is full of holes and some of it is almost liquid. Because it was so wet near the river, two of the stations on ...
Underground railway stations built on surface and sunk into ground 100 years ago
from ElectronicsWeekly http://www.electronicsweekly.com/blogs/engineer-in-wonderland/underground-railway-stations-built-on-surface-and-sunk-into-ground-100-years-ago-2016-07/
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