Don't Wikipedia it--you won't find it there in the listings. A friend--who I haven't seen since--told me that the some write it as StoryTeller because its not a man or a woman. That the StoryTeller lives out here somewhere in cyberspace, flitting in and out of the great data centers of New Boston.
The most credible account I have heard is that he is just an old man who runs the old steam train between here and there. He runs the Engine with an ease that lets you know he was born to do it, and that he'll do it till he passes. If you're lucky, he might call you into the Engine room from the station platform, and fill your head with stories while the old steam train chugs to there, or to here, whichever way you are heading.