Has anyone here read the story, "A Room Forever" by Breece D'J Pancake, that inspired Mark to write this song?
I have not read it, but in looking at the author's biography,  it is in keeping with many of Mark's  other songs.  Breece Pancake was a talented short story writer who had published a couple of stories in the Atlantic  Monthly, which is a fairly  prestigious literary magazine. He was from West Virginia, which is a poor, rural, coal mining state with a lot of similarities  to the northeast of England. He committed  suicide in 1979 at age 26 and his collected short stories were posthumously  nominated for the Pulitzer Prize.  He was clearly a very talented writer who killed himself just as he was beginning to  make  his mark.
Hopefully  I can track down a copy of his short story.