My dad used to commute to New York City from Peekskill and Croton Harmon, this channel has a focus on the trains I grew up watching and some I also had the privilege to ride. TWO video's are of special interest:
This one and the one he did on EMD Fl9's
END - FL9's Excellent Video! ( For the historical types )
Locomotive identification, railfan locations, frequency information, etc. can be found here.