This is certainly one way to do it. Not sure I've seen any one model the South Shore in a rail simulator before.
Rail sims are an on-again, off-again interest for me. I wrote an article about the Trainz rail sim for Model Railroader in 2003 (link behind paywall). After the article and since, I've heard from folks around the model railroad press that coverage of train sims tends to meet with vehement objection.
Never mind the haters, I'm still intrigued by the possibilities of testing out layout design and operations concepts using simulations, both the 2- and 3-dimensional kind. And also by the artistry of this modeling medium itself.