From my outsider perspective, the issue just seems to be that it's really far. It's about 35km or 22 miles from the terminal to central DC by way the crow flies compared to about 20km / 12 miles from midtown to JFK and 24km / 15 miles from the Loop to O'Hare. For all intents and purposes, the DC metrorail is already an express service given the wide station spacing and high top speeds compared to many metro systems. The idea of building a separate dedicated rail line or significantly more expensive version of the silver line just for the sake of ultra express airport service seems quite excessive given the cost. Greater Washington already has the strongest regional rail system in the US imo, perhaps tied with BART, so while anything could be better it has some of the least room for improvement.
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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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