I would imagine so but on the other hand perhaps not, Cousin; From Boston.

Many times boring is the cheapest way to go.
There would be many obstacles encountered in the construction of an above ground rail, not the least of which would be traffic delays. One would have to route around, up or under thousands of utility lines already underground. Fiber optic, steam, storm, sanitary, telephone, ,gas

, electrical etc.,etc, during the construction of an above ground rail- though above ground is the best option. This method above is exacting and time consuming work though. Many utility lines are not even located on, nor located where, City Documented Underground Prints predict they will be encountered

. So. These underground lines will either be struck or located... very tentatively.. Some antiquated service lines might be abandoned and others might have no city record at all of their very existence.

All this anticipation for the raising of spread footings of the heavy load bearing pillars an above ground rail requires.
Don't even fracture a fiber optic line. It makes one hell of a mess. I recall one instance where a fiber optic line outside the Atlanta Airport was severed with an Excavator. The air traffic is very busy overhead of course.

Well this move severed the Air traffic control tower off all communication with the airplanes roaming around the air over Atlanta. Also it is very, prohibitively, unbelievably, expensive to repair Fiber Optic. Insurance has to pay, and will even affect future bonding rates for the company.
Underground there are no obstacles except for the Aquifer. Don't mess with mother nature I say. Humans are the most invasive species of all.
Quote:
Originally Posted by JACKinBeantown
Wouldn't it be so much easier to build an above ground system?
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