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@Matt Johnson:
The engineering challenge of building the wye tunnels between the C and L routes north of Pentagon would be no more difficult then it was to excavate and build the cut and cover tunnels that are already there. The only challenge today is connecting those tunnels to the existing tunnels near the Water Entrance to the Pentagon.

@Lou:
All of the tunnels from Foggy Bottom to Court House and from Rosslyn to the portal north of Arlington Cemetery are bored through the bedrock. With today's technology it would be easier. The tunnels were mined back in the late 1960 and early 1970s using the drill and blast method.

@J, Transport:
It is not the switches in the junction on the south end of Rosslyn that are the limiting factor. It is the speed at which trains can be discharged and boarded at station platforms. The signaling system is designed for 90 second headways. With no passengers discharged and boarded the trains WMATA would have no problem running trains at 90 second headways.

by Sand Box John on Jul 1, 2010 12:09 am • link • report

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