I thought this was way down on the "maybe someday" list, but WTOP seems to think that the funding is mostly in place and that this 15 minute from DC to Baltimore MagLev train is actually going to happen. It accelerates to 300+ mph in just 3 minutes and may make just one stop at BWI. It is approximately a 40 mile trip with BWI about 13 miles south of Baltimore, so if the train stops at BWI on every trip it won't get up to full speed for very long on the northern leg.
They also mention that the group that is working on it wants to extend the line all the way to New York, but that wouldn't start until 2030 or 2035.
Japan International Bank is mentioned as being on board to provide 50% of the construction cost.
Construction to start in 2019, according to the article.