You can find several additional scenarios for this route on the website of Golden Age of Railroading. These scenarios are freeware, but may require additional payware content. Please visit Golden Age of Railroading for more information.
The Springfield route comes ready to run with a pre-configured QuickDrive scenario. To play the route using the QuickDrive mode, go to the drive menu of Train Simulator and click the Quick Drive button. On the following screen, first press the Route button and select the VNHRR Springfield Route, then pick one of the pre-made trains to run. Ajust the environment options and you're ready to go.