Quote:
Originally Posted by Busy Bee
New and exciting solutions are on the horizon though including exploring fitting the stations within the diameter of the bore so all you need to do is mine surface access without needing to dig a battleship sized hole in the ground (or mine it out of rock). This is most notably being explored in one of the Sepulveda single bore heavy rail options.
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VTA is doing this for the BART San Jose extension. It is *more* expensive than a traditional sequence with cut/cover stations, due to the increased volume of soil removal and the (much) deeper stations.