It's Payware of type "Region" Name= "USA - Model Trains"
Dependants are:
TRS19 - The Port Zyd & Fulazturn Railroad
Port Zyd & Fulazturn Railraod (4.4)
The Shortz & Kerl Traction Railroad
Franklin Avenue Industrial
I don't think Philskene would have used it and I note the author is Tony_Hillian so N3V must have changed it on those routes for some reason or it got marked as Payware when it shouldn't.
Edit: To verify I just installed Needles and yes, it does call for and use that "Payware" Region. I have no missing assets for the route.