I don't know how many modelers use youtube to get modeling info but the modern eras guys can learn a lot about trains from watching video. My fav is Stobe the hobo who sadly was killed about a year ago but left and interesting record of the trains and railroad towns in many parts of the country. Great views of rolling stock in operation and trackside scenery from the point of view of the trains. I wish the transition era riders had this modern video equipment so there would have been more stuff from that era....DaveB

Shorpy.com has recently run a stack of pictures from Russell Lee, including many showing the area served by the Colorado narrow gauge.

I don't know if these images are generally well known or whether they have been published before, but you can see them here (amongst a few other subjects, scroll down a bit for the train stuff).

Where steam locomotives are still king

http://www.bbc.com/travel/gallery/20180716-the-railway-that-united-islam

I put this in my blog, but I think I want to put it here as well...

This is the Knott's Berry Farm Railroad...

This guy does a lot of videos about theme park history, and was recently doing a video on Knott's Berry Farm (check his Youtube for more on Knott's if you're interested)

He's a bit excitable, of course (like taking a kid to a theme park for the first time) While he was doing his video, he got invited by Knott's to come in the following day to do a show all about their steam engines.