Short line mysteries

So now this NHN thing really fascinates me. They seem to own a half-dozen or so engines and some amount of rolling stock; who maintains them, and where? It doesn't seem like it'd be economical to build a repair facility for that little equipment, but you also can't really let your trains rot. And how do trains get from point A to point B? It seems like NHN's main purpose is to move sand between Ossipee, NH and Boston, but even if NHN/BSG owns the rail on both ends, you still need to move across MBTA and Guilford/B&M track in between, which presumably involves some exchange of money and some scheduling. (Apparently NHN owns about 40 miles of track between the Guilford main line in Dover, NH and Ossipee.) Though the "scheduling" aspect does explain why I've only seen NHN trains parked at the Boston BSG facility or after midnight.

And of course, the final question is, "is it actually economical for Boston Sand and Gravel to own a railroad"? Presumably BSG could contract with someone like Guilford to actually move the sand (and for all I know NHN does subcontract to Guilford for maintenance and crews); the only issue is the capital, and I could see it being convenient for various federal regulations to have a separate company doing that. I could also seeing Guilford saying "but we'd have to buy sand hoppers then, and you'd be our only customer for that, so no".

Did I become a student when I wasn't looking?

Recent paper mail seems to have included a couple of solicitations to consolidate my student loans and a student subscription to Playboy. I wonder if somehow the postal spammers got a "student" bit set for me; I haven't been a real student for two years, or a special student for about nine months, and I've paid off my loans now. I probably should get my annual free credit report just to make sure there's not something screwy going on, though. Being employed by MIT can't help the situation, but I kind of had the impression that MIT had at least as many faculty and staff as students, so this can't be that uncommon.