This was only a few kilometers long and had at - grade crossings connections with the old line in both directions .
It allowed medium - and long - distance trains to pass regional and freight trains , which had previously not been possible except at Melegnano station .
Although this was only a few kilometers long and had at - grade crossings connections with the old line in both directions , it allowed medium - and long - distance trains to pass regional and freight trains , which had previously not been possible except at Melegnano station .