Real railroad Round Houses almost always have the steam locomotive enter, engine first. This is because there is more room to work on engines at the back of the round house. Therefore, most round houses have the round house smoke stacks on the roof in the near the back of the RH.
Engines in first with Coal Tenders visible the more Realistic way. Engines are under roof smoke Stacks
More room is available to work on the steam locos at the back of the RH, shown with homemade short Vanderbilt tender
I may have to ignore Realistic train operation in this case as I prefer seeing the beautiful fronts of my engines compared to the rear ends of some coal tenders
Some Lionel 2035 steamers, three with rebuilt boiler front lights
Charlie