Here we see the train which is travelling from Inverness to Glasgow Queen Street. You can see the River Tay to the right of the photo.
The River Tay is the longest river in Scotland and the seventh-longest in the United Kingdom. The Tay originates in western Scotland on the slopes of Ben Lui, then flows easterly across the Highlands, through Loch Dochhart, Loch Iubhair and Loch Tay, then continues east through Strathtay in the centre of Scotland, then southeasterly through Perth, where it becomes tidal, to its mouth at the Firth of Tay, south of Dundee. It is the largest river in the UK by volume of discharge.