The Cornish Main Line runs from Plymouth down to Penzance and is approximately 79 miles In length.
It is planned that the Cornish Main Line will be available as a stand-alone route as well as an add-on for Western Mainlines if you have the South Devon Main Line add-on installed. With South Devon Main line and Cornish Main Line added onto Western Mainlines, you will be able to drive all 300 miles from London Paddington to Penzance.