Arnold,
It seems to me that this may be a guiding principle for what we do put onto our model railroads. Whether it's a particular railroad, locomotive, passenger car, boxcar, caboose, automobile, truck, house, structure, place, business, or home town, it's usually something that we love or that has sentimental value. On my own layout, the Ameritowne building pictured below is a very close representation of my wife's family business in Bridgeport, Connecticut, which sold heating and plumbing supplies from 1913 until it closed in 2018. Grandpa Maury is looking out the window waiting for some business to walk through the door.
MELGAR