I was thinking, while sitting in traffic, on the way to work this morning! - We would have to petition the spouse everytime we bought something. - Petition the spouse everytime we planned an expansion. - Couldn't start up a commuter run on an old branch line (the model neighbors would complain). - Couldn't model coal mines, or run long coal drags to power plants. (Same reason as above). - Couldn't do anything we wanted because everyone would complain. We would all be arm-chair modelers. Anything else?