DC Metrorail system is less than half underground overall, but the majority is underground within the DC limits. The big exception being the red line between Union Station and the DC limits near Silver Spring where it runs along a surface mainline rail corridor.
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"The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man." - George Bernard Shaw
Don't ask people not to debate a topic. Just stop making debatable assertions. Problem solved.
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