As Rich Melvin pointed out, there is a lot of very useful information on YouTube, but you need to be selective.
I have a YouTube channel of my own, Pennsy Productions. Consider checking it out if you like seeing the real things in action! And don't worry, I have a model railroad video or two in the works. 
Some of my favorite YouTube channels include:
- Blue Comet Productions
- Joseph Fusco
- ToledoRails
- SteamTrainVideos.com
- SmokyMtnSteam
- MPT 1225
- High Iron
- Dynamo Productions
- Belt Line Productions
- Eastern PA Railfan Productions
- Trainman K
Some of my favorite modeling channels include:
Dakman Productions ,Eric’s Trains , Max Railroad, JD Strucks. And Muffins to name a few. All give different views of this great hobby.
Some amateur videos move so slow I run out of patience fast. When they have more experience many are really good.
On train layout videos my interest is high rail. When they show a lot of RR trivia, posters on the wall, trains on shelves, I began to run out of time fast. Automated accessories and automation are better but only trivial interest.
Another interest is Honda engine swaps, they get terribly complicated with todays electronics especially compares to V8 hot rods. Sometimes people who you sure couldn't tell by their looks are really smart.
How do people dig up these threads from 6 years ago? I can't find one that was posted last week.
So many great recommendations! Already, I have subscribed to a bunch more that were recommended above. During this stay at home time, it's good to keep busy and have so much down time options.
Sometimes I'll watch a RR live-cam, mainly the one in downtown Ashland, VA. This one shows trains coming through that I have ridden on... the Silver Meteor and Silver Star, NYC to Miami. Southbound, they go through (non stop) at around 4:48 pm and 9:15 pm Eastern time. When on a trip I take a video of my train arriving in Philadelphia, then a little on the train. When Ashland gets near, I'm all set to film it off of my laptop screen. I get a few "How did you do that?".
These sites have people from around the world watching and commenting...however, the subject matter is rarely trains. Truly, some of these people need to "get a life".
You can turn off comments on your own videos if that works. The comment section is weird for sure.
Several YouTube things that irritate me is long entros, music choices, rambling, and bouncing cameras.
Too many just take forever to get to the point of anything. Then others ruin it with music which most of the time isn't needed. I mute many of these. There are some restoration ones I like where you just here the ambient sounds of what they're doing. I like that better.
Then there's those that ramble to fill the gaps. Not every thought is needed.
Final issue is the camera bouncing all around. I see a lot of layout videos do this. It's like the Blair Witch phenomenon. Makes my head hurt.
Some neat ones recently are forum member @SantaFeJim, short and simple. Easy to watch. No unneeded extras. Clean stable shots.
I mostly watch the following:
TrainworldTV
Ericstrains
Ravenhawk6910
McMuffinstrains
Pghtrainfanatic
NJhighrailers
I spend a lot time on youTube. I enjoy listening to old music from when i was a boy. I love to watch people fish. Especially for muskies. I enjoy listening to music from movies. Whenever, I purchase a new fishing lure I will sometimes go on youTube to see how to use it. Watching old video's of some of my favorite sports stars is great.
Off the top of my head, I watch Eric and Mr. Muffin, as well as some of the Live Rail cams, especially HSC and a couple others. I also search out historic rail films. I occasionally watch people's layout videos, but I get bored easily, and production values vary widely, so if they're too long or the narrator drones on and on, I'm done. I like POV videos, and some of the how-to videos, also.
YouTube is the greatest for how-to videos - anything from resetting your automobile clock to daylight savings time or repairing your lawn mower or setting intonation on your electric guitar. You just have to find a video made by someone who doesn't just like to hear himself talk. 
Plus, it was nice to be able make a record of and share videos of my now "extinct" layout:
Jim
Yep....the comments and links above are some of my favorites too! I even have a YouTube channel...need to update it with new videos and will do that as soon as run 314 has been published.
I watch You Tube on my TV through TIVO or ROKU. I'm not signed in, but You Tube knows I like train topics; both Real and Model. The recent Train World podcasts popped up in my viewing choices. I didn't have to search for them.
uploads of Don Mccuaig, that's mine. Many layout and real trains. Mainland and Maui. Lots of diving videos also. Don
@Jim Policastro posted:YouTube is the greatest for how-to videos - anything from resetting your automobile clock to daylight savings time
This cracked me up. My Outback owner's manual explaining this was "Greek" to me. The YouTube video made it very clear.
Linus Tech Tips
Apau Hawaii Tours
The Slow Mo Guys
BBC Earth (David Attenborough)
One of my favorite YouTube channels is Toy Man Television. Not much O gauge but entertaining.
@TexasSP posted:You can turn off comments on your own videos if that works. The comment section is weird for sure.
Several YouTube things that irritate me is long entros, music choices, rambling, and bouncing cameras.
Too many just take forever to get to the point of anything. Then others ruin it with music which most of the time isn't needed. I mute many of these. There are some restoration ones I like where you just here the ambient sounds of what they're doing. I like that better.
Then there's those that ramble to fill the gaps. Not every thought is needed.
Final issue is the camera bouncing all around. I see a lot of layout videos do this. It's like the Blair Witch phenomenon. Makes my head hurt.
Some neat ones recently are forum member @SantaFeJim, short and simple. Easy to watch. No unneeded extras. Clean stable shots.
Amen, brother! And yet YouTube "encourages" every irritation you mention above. Ultimately, they want to keep eyes on YouTube in general to sell ads even if it alienates many of us going there for entertainment, recommendations, or how to's.
I encourage everyone to subscribe to their favorite channels so good behavior will be rewarded over the annoying trends and your favorite content providers will be higher in the youtube search engine . Keep in mind that subscribing is not the same as notifications which can be another annoyance. Subscribing just makes it convenient to find your favorite content creators again rather than youtube guessing at what they think you would be interested in.
I like some of these guys u-tubes
Musicalcraft lots of 027
Lou Costabile
ChooChooCharlie001 027 layout some have seen
bobntrains
brwilli6
03patines
I can spend hours watching u tubes, trains, airplanes, Midway and other battles, cars, music of old songs and singers, etc
Charlie
