There is a motor car club in Wolfboro, NH. They have permission to use the former B&M Wolfboro Branch at any time, so the number of runs you can make is unlimited. Go to
www.CVRTC.org
As a club member, you can also get involved in other maintenance activities on other RRs in the region using your motor car.
Once a year, there is a run on the Hobo RR from Lincoln, NH to Weirs Beach, about 34 miles each way. It's an organized, whole day event.
Finally, there is a NARCOA affiliate in RI that assembles trips all over the Northeast, some as long as a week. Go to
http://www.narcoa.org/
It is allot of fun.
Engineer999