Here's your chance to take that trip to Fitchburg you've been dying to do: On Patriots Day, you'll be able to ride anywhere commuter rail goes for $15 for the whole day. The "Marathon Pass" is available starting today on the mTicket app and starting Wednesday at ticket offices at North South and Back Bay stations. Don't worry about missing out - the pass will also be available on the trains themselves on April 15.

The T will also be selling $5 CharlieCards to people who want to take the subway to and from the Marathon or the other stuff going on that day, such as the recreation of Paul Revere's ride. Regular T riders will, of course, stifle a snort, since a round trip on the subway normally would cost $4.50 with a CharlieCard - although the pass is a 50-cent saving over what a round-trip CharlieTicket would cost.

The $5 cards will be for sale on Monday at Alewife, Back Bay, Braintree, Fenway, Quincy Adams and Riverside.