Norfolk Southern, some CSX, and Pan Am for freight and a nice little shortline track. MBTA commuter rail for passenger cars; you have to travel a bit for an Amtrak station 'though. Otherwise, it's a little bit of heaven. I can hear the commuter rail horn from several miles away but not as often as years past.
Commuting to work and around neighboring towns, I see quite a few intermodal trucks, which I include in my definition of railroading fun/research. The most common at the moment are white J.B. Hunt 18-wheelers with the yellow logo and "Intermodal" in bright green letters on the side - hard to miss. Some day I hope to track them to their spawning ground with camera in hand. Speaking of which, I walked part of an abandoned Boston & Maine track yesterday that will be converted to a rail trail. Do rail trails count?
Tomlinson Run Railroad
