Jacobite Steam Train (Road to the Isles) Harry Potter fans would definitely recognise the iconic Glenfinnan viaduct! Yes, this scene was featured in four of the famous Harry Potter film series. Whether you’re a Harry Potter fan or not, a train journey on the Jacobite steam train would definitely create memories that will last for a lifetime. Starting from Ben Nevis (the highest mountain in Britain), the train will chug through Arisaig, towards the deepest freshwater loch in Britain (Loch Morar) as well as River Morar and finally, the journey culminates at Loch Nevis, the deepest seawater loch in Europe. Be sure to expect lots of stunning scenery and have your cameras at the ready!