I think nyc 999 can be seen anytime in rdr2 mainly in Saint Denis. The chapter 1/private train tender is probably a customization cause other locomotives do have that cab tender in real life like frisco 1630 tender
I'm not sure if anyone else ever noticed this stunning little mechanical detail, but the locomotive drive wheels are are phased at 90° apart from the right to left sides of the train just like real trains. Meaning that as the right side piston is on it's power stroke the left piston will be on it's power stroke 90° later. Unless you're looking for this specifically you'd never even notice it, someone put some real love into designing this game. 🙂🇦🇺
I like this video you've researched most of the things you got the facts around but can I just say this you're complaining that they added the link and pin coupler over the cow catcher and did not fill in the hole where the knuckle coupler would go yet the draw bar on the tender is replaced with a knuckle coupler