“I eat most of my meals on the train!” said Nisse Greenberg, 25, between bites of a falafel sandwich yesterday on the N line.
A bit of local knowledge: if the conversation took place in London, Nisse Greenberg was on 'the Northern Line' (not 'the N. line'). The Northern Line is not particularly northern; it simply connects the north of London with the south. I've never heard it called 'the N. line' (though in an SMS message I suppose it might be).
I thought maybe something like that was behind it. Hence my ' if the conversation took place in London...'. Come to think of it, the falafel sandwich might well place it in New York - sounds most unBritish!