info on NYC upper Harlem line

Looking for some info on NYC upper Harlem line, someone suggested the Book Rails along the Hudson, great book, but nothing about the harlem line. I am in the process of buidling a layout and would like to model some parts of the line, since it ran through the town where I live. So I am looking for any books or any sites. thanks

http://www.railroad.net/articles/railfanning/harlemdivision/Default.asp This link may help you.Don