The Line To Hogwarts

Through the mountains, to the far wild west of the highlands, runs the rail line to Mallaig, a gateway to the western isles.
As it passes through the tunnels in these wild mountains, but before it runs along the loch that lies between them, a strange and little known event occurs.
Yes, you will see the train appear again, but not its magical counterpart that veers off into the fastness of the wilderness and into the dimension of the sidhe, making its way to Hogwarts.
For this is the real Harry Potter Line.