Channeling the classic episode of The Simpsons, were you aware that the corridor from Bethesda to Silver Spring could have been a monorail type train, known as an Aeromovel? This odd type of transport uses compressed air to “push” the train along on an elevated platform, and was considered as an alternative for reuse of the Georgetown Branch between the two cities. A study was done and a copy can be found in the Chevy Chase Historical Society archives. http://chevychasehistory.pastperfectonline.com/library/37E6A661-EAA1-4262-BBB2-190821234210