I currently do this commute every day. I do Capital Bikeshare from Adams Morgan to Union Station to MARC. There is a 7:20 AM express train directly to Penn Station so the morning commute is a little over an hour. Unfortunately, there is no true express in the afternoon so it takes a little longer. It is wearing and I am currently looking for another job in DC. However, if its a temporary position its a doable commute especially with a defined end in the future. The monthly MARC pass is $175 if you employer doesn’t pay for your transportation costs. I will be on the train bright and early tomorrow.