It's not really possible to accurately represent a real city in SImutrans (inaccurately representing one is easy, of course) - it's got serious problems with scale, in several different forms.
All ways are exactly 1 tile wide, all residential, commercial, and industrial buildings occupy exactly one tile. In real life, streets and railways are normally only a few meters wide. Buildings vary widely in size, ane are almost always much larger than that in both dimensions.
There's also problems of economic scale. The number of factories of each type that get randomly generated, and their production and consumption levels, are not particularly good matches to reality - they've been set primarily with the goal of making a good game, rather than an accurate simulation.