The Glenfinnan Viaduct, famous for the Jacobite Steam Train (Hogwarts Express), is easily accessible by car, bus, or train to Glenfinnan, with a visitor centre and paid parking. Viewing the viaduct from designated viewpoints is free and can be done solo, though guided tours often combine it with other Scottish Highlands attractions. While accessible year-round, the prime viewing period is typically late spring to early autumn when the Jacobite Steam Train operates, usually twice daily; checking the train schedule is crucial for the iconic crossing. A typical visit to the viewpoints lasts 1-2 hours, allowing time for parking and a short walk. Be aware that winter can bring challenging weather conditions, and peak season sees large crowds, especially around train crossing times. Riding the train itself is a separate, more expensive experience.