I saw them at that time range.

I was living two stations away from Университе́т on the red line and riding the train daily to / from MGU. And they were well fed enough that they regularly refused part of my late night blinis.

The unrealistic part of this article is a subway guard that doesn't already hate all people.

I really want this to be true... There's the metrodog website mentioned in the article that's got videos of dogs getting on and off the subway and using the elevator. Maybe it's just less common than the article makes it seem?

White collar workers do absolutely use metro all the time. It's the primary audience. Maybe you're confusing white collar with executive level.