YouTube credits:
Always Trains HD:
SFBR 23 (alco S2) Switching With a Leslie s5t
   • SFBR 23 (Alco S2) Switching With a Le...  

Other credits
(Not sponsored)
DL109 Video Footage:
(DVD) New York, New Haven & Hartford Railroad Volume 1 A & R Productions
Note: the original publishers website (www.classicrailroadvideos.com) seems to be defunct.

Picture of Buffalo Creek HH660 #43
www.Wikipeida.org user Prrbaldwin
https://creativecommons.org/licenses/...

Picture of Midland NW2
www.wikimedia.org user Russel Meier CC by SA 3.0
https://creativecommons.org/licenses/...