well, perhaps a high speed railway system isnt the necessity. but a better MARC trains system would be nice!
The MARC train doesnt even RUN on the weekends!!! and i doubt it runs past 10pm on weekdays. the railway system is in place, but due to limited hours and the fact that Penn Station and Camden stations in Baltimore are not really located within walking distance to anything fun in Baltimre (except the stadiums) that its just not used.
In Boston, you can catch the train to Providence whenever you want almost, and its highly accessible and easy to use. and in turn, commutes between the two, benefit both cities.