The cabin of the Waterloo was decorated with scenes of the battle featuring Scottish regiments of the line.

Reference:
An article by Graham Lappin published in "Clyde Steamers" magazine and given to the curator by the author.

The title of the song says that the Dumbarton Castle plied between Glasgow and Inverary at the head of Loch Fyne¹ (see map). 

She went to the Forth in 1819 but later returned to the Clyde. She appears to have been sunk off the Irish coast c1838

Reference:
An article by Graham Lappin published in "Clyde Steamers" magazine and given to the curator by the author