Quote:
Originally Posted by mrnyc
i seriously doubt being wider and longer than typical affects costs to the extent that its a reason for the ridiculously high costs of building rail transit in nyc.
but there is certainly a cumulative effect of everything.  |
The platforms are 600 feet long (most metro systems are 300-400 feet), meaning the whole station structure is at least 700 feet long. This means any station (even a "minor" local station where there is some design flexibility) will almost certainly a)interfere with many major utilities and b)require extensive underpinning of area foundations.
Things get really expensive at the interchange stations because the station
must be built very close to an existing station and so the hand is forced. For example, the new SAS 125th station must be built between Park Ave. and Lexington Ave. It doesn't have the option of being to the west of Park or the east of Lexington, where better soil/utility/underpinning conditions might exist.