Washington, DC's metro transit system just added a new feature we all have been waiting for you a while. Now we can add money to our SmartTrip cards online. No longer do we have to wait in line at the subway station or try to balance on a moving bus to add money to our card. Just log onto to the WMATA website, log in and add money with your debit or credit card! I know some people may be thinking big deal but I have been in long lines especially behind tourists who do not know how to operate the machine and sometimes it is painful when you are in a hurry.
The metro system is not perfect but it gets you around the city in a fairly easy fashion and it is user friendly especially with a city is full of local commuters, tourists and business travelers.
General information, Metro is the 2nd busiest mass transist system in the United States trains and buses traveling from Maryland, Viriginia and Washington, DC. DC has 40 metro stations with rest surrounding the Washington DC area.
Here is more information on the Washington, DC Metro System