Harry Potter rail line closed by 50-acre fire
Network Rail said the alarm was raised at 11:10am, 20 minutes after the Jacobite steam train had passed the location.
The route was closed at noon with disruption expected until 5pm.
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Hide AdThe Scottish Fire and Rescue Service said firefighters and four appliances were tackling the 50-acre blaze, which has been brought under control.
West Coast Railways, which operates the weekday steam service, was unable to say yet whether the train had been involved.
A spokesman said: "We take this very seriously and have been taking additional precautions, which have included patrols following the train."
The route, including the Glenfinnan Viaduct, featured in the Harry Potter film series.