Can the Red Line share the existing Metro tunnel downtown, thereby eliminating the need to build a new tunnel downtown?

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Can the Red Line share the existing Metro tunnel downtown, thereby eliminating the need to build a new tunnel downtown?

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A thorough investigation was performed to see if the Red Line could share the existing Metro tunnel downtown. It does not appear worthwhile. Here’s why. The existing Metro tunnel runs in a north-south direction under Eutaw Street, then east-west under Baltimore Street turning in a northeast direction again toward Johns Hopkins Hospital. The east-west portion under Baltimore Street that could be shared with the Red Line is about 4,000 feet long. Another 6,000 feet of tunnel would be needed to reach the Red Line portals to the east and west of downtown (4,000 feet to the west of the Metro tunnel and 2,000 feet to the east of the Metro tunnel). The connections to break into the existing tunnel at either end require detailed, precise work that is more costly compared to the machine boring that would otherwise be used for a new Red Line tunnel. In addition, because light rail vehicles are narrower than the heavy-rail Metro vehicles, and the Metro vehicles are much too large to run on city s

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