That's pretty good. Driving that would take about 45 minutes and I know I have been up and down the Philly to D.C. route a number of times on Amtrak (including on the Acela a few lucky times) and coming/going out of Penn and BWI stations could be dicey. We sometimes would get off the Amtrak train at New Carrollton and then hop on the Metro Orange Line to downtown and transfer to the Red Line to get to the offices we needed to go to.
I did have the pleasure of using Amtrak from Philly to Baltimore (as a destination for a work trip) during one of the nastiest ice storms that we ever had here in Philly back in January 1994 (when Philly completely ran out of road salt and all the stores were out of halite for consumers). When I returned home, I was able to bring a couple bags of halite with me in my suitcase thanks to a Baltimore Riteaid! 
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