A better (and perhaps cheaper) solution would be to use either Cities in Motion which has a good transportation model, or Cities XL (I'd suggest the 2011 version for price and performance over 2012) which has a good balanced play as the cities grow in size. These seem from initial new SC exposure, to be better models for teaching and from a learning perspective. As well the saved games feature (hardly a feature, more a necessity for most of us) is far more valuable for teaching lessons, which the new SC lacks.