I can't work out from the video or the Grand Museum website where the locos and rolling stock were sourced. Many look like Western European prototypes. With 250 locos in all I suppose that many could have been converted to resemble modern Russian equipment. I'm not aware, but have not checked, whether there's a lot of Russian models around. I know there are certainly many Chinese and Japanese model trains available.
This is the second biggest model train layout after the one in Germany that I think has been posted here before. It's been in operation since 2011.
Incidentally, I still get the occasional flyers from one of the main Midwestern Euro HO dealers (Reynaulds) and today it includes the newest Faller accessories, many of the older versions of which I am sure I've seen on the Russian layout. The new ones are pretty extraordinary including a complex carnival "ghost ride" (or maybe its a torture chamber):
Anyone notice how realistic they made the water and wave effects for the Beach scenes?
Yeah, and as the video camera pans over it, the water appears to be flowing/rippling. It had me fooled at first until the camera motion stopped. It also appears to be highly reflective but that could be a paint effect rather than using epoxy or textured plastic sheet. In any case it’s very convincing.