Some of these look promising.
The Baltimore Tunnel replacement will do a lot of good, as well as the Bridge Replacements.
Southern Maryland MARC service in my opinion is the easiest bang for the buck. The track is barely used by CSX and has good wye access to the NEC. I would propose the trains run MAS from the wye to Union Station and use the New Carlton bypass.
I'm wondering how Baltimore to Frederick MARC service over the OML would work. That's still a fairly active line.
MARC to the Eastern Shore, I like it, and I think a lot of people would use it. The Berlin right away I see is problematic, so what I would do is build a large station where the line crosses MD-90 called "Ocean Transfer." The line can still terminate in Berlin though. At Ocean Transfer, you'll board a bus to Ocean City, which is included in the ticket price. There will be two bus routes. One from Inlet-61st Street and one from 62nd-MD Line.
I am 100% against the Maglev and Monorail when there are so many other useful projects that will do so much more good.
Lastly, I'll ask the question...
With the amount of growth in south central PA, is it time for Maryland to start talking about relaying the NCR and establishing a York to Baltimore route?
Ave Atque Vale