Thoughts on a train

I'm always struck by how people often appear reflective while traveling. She wasn't looking at much -- we were rolling through a part of industrial London -- and the window was just an excuse. She had gotten onto the train at the same stop I did but while I was traveling alone she was with a large family. She wasn't ignoring them, but somehow managed to drift off on her own for a moment of quiet while her husband and daughter chatted next to me.