Here is Derek Coopers video of his Roundhouse Russell and Silver Lady, together with his Accucraft Lyn on his railway in New Zealand. Simple passing shots give a good idea of the sound on a level track.
Here is Steve Jackson's Silver Lady hauling Accucraft W&L stock on Ralph Pitcher's amazing Cathedral Mountain Railway.
Here is A Roundouse Silver Lady running on the Charnwood Forest Railway which is run for the public at the Great Central Railway.