It is pretty clear that operation instructions for using Trainz is non-existent, which surprises me. I need help. How does one replace automobiles on the roads in Trainz Mac. I'm modeling a steam railroad circa 1940s. A 1990 Jag zipping down the road just doesn't look right. Most answers relating to this say to go to the Configuration text file. What configuration text file? When I go to surveyor, I immediately get into surveyor with no options to go to files. Where are these mysterious files? Is this unique to Mac users? Since there are no manuals (who would have guessed), I'd appreciate some input.