Interurban Interlude. A History of the North Jersey Rapid Transit. by Cdr. EJ Quinby.
The book is out of print, but you can borrow a copy from the Glen Rock Library. If you are not close to Glen Rock use the BCCLS library system on the internet to see if there is a town closer with a copy or you can also use this system to have a copy sent to your local library . BCCLS is the Bergen Coopertive Library System, I do not know if other counties have this.
By the way you can hike or bike almost the whole right of way to this day from Fair Lawn to Suffern. It is also easy to follow the old right of way on BING maps with the detailed birds eye view.