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7/16/2025, 5:00:06 PM
>>16725881
OP, that is called cut & cover, and has been used for building underground rail since the 1860s (the very first underground rail in the world, in London, used this method). As others mentioned, it has fallen out of favor due to all the stuff you have to move out of the way when digging in a modern city.
OP, that is called cut & cover, and has been used for building underground rail since the 1860s (the very first underground rail in the world, in London, used this method). As others mentioned, it has fallen out of favor due to all the stuff you have to move out of the way when digging in a modern city.
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