The modernisation process carried out by FNM at the threshold of the third millennium and far beyond began with duplication of the existing line between Milano Bovisa and Saronno, the busiest section of the entire railway network. This was an unavoidable step, given the substantial increase in the number of passengers, as well as the technological development which finally allowed further improvement of rail circulation in terms of the railway services offered. Like the world around it, the railway was inevitably thinking about its future transformation.