This postcard view of Georgetown, likely from 1942, shows some of the extensive flooding along the waterfront
At the same time, while searching for more info on flooding, I stumbled across some stock video footage that shows 1936 Georgetown for a brief moment. Photos of the branch are rare; video doubly so. The Georgetown section begins at about the 56-second mark.
The Purple Line folks have shared a couple images on Facebook. The shots were taken atop the old B&O abutments to the trestle across Rock Creek. The new right of way is about 15′ lower than the original RoW. They “shaved” the top down. (the new bridges will be much lower than the original one.) https://www.facebook.com/marylandpurpleline/