I think that adding the Amtrak Downeaster would be really cool. The Downeaster is a 145-mile passenger train service operated by Amtrak and managed by the Northern New England Passenger Rail Authority, an agency of the state of Maine. It goes from Boston North Station to Brunswick in Maine. Most Downeaster trains consist of five cars hauled by a locomotive. The passenger cars are the Amfleet I series passenger cars built by the Budd Company in the mid-to-late 1970s. Most trains include an Amfleet club car which has a combination of Business Class seating with a Café (food service/lounge) and four Coach Class cars. Trains are pulled or pushed on the northbound end of the train by a GE Genesis diesel locomotive at speeds up to 79 mph (127 km/h). A second GE Genesis or a Non-Powered Control Unit (a former EMD F40PH locomotive converted into a control car) runs on the southbound end of the train.
Your suggestion is good, but the length is a bit too long for dtg to do. Average length is about 50-60 miles so is there somewhere in the middle where it could reasonably stop at?