If anyone likes the FL9's, I would recommend, Diesels to Park Avenue. I would also recommend my own book, Metro-North's Hudson Line, Poughkeepsie to Oscawana. Excuse the self promotion! The first book covers FL9's mostly operating over New Haven trackage (if I recall correctly)...my book is limited to the Upper Hudson, after Metro-North absorbed them into their system.
I’m sure Vol. II will have many more FL9’s... (sorry Tom - couldn’t resist)
But seriously... I picked up Tom’s book at the White Plains Train Show last December and it is a treasure trove of info and wonderful pictures from the steam era (some nice NYC action) to current diesels/electrics - well worth the price.