Sidney is a small saddle tank engine who runs the Seaside Branch Line near Duck's Branch Line.


When Sidney first arrived on Sodor, Duck had to collect the new engine from Brendam Docks and deliver him to a Scenic Railway on Duck's goods train. Sidney started to boast about scenic view that his railway had to offer, and Duck argued with him saying that his branch line was more picturesque. When he managed to show Sidney all the splendid sites that Sodor had to offer, Sidney even admitted that maybe he was wrong about whose line would have better views. Duck promised Sidney that he will bring plenty of passengers to him on his new railway at the Holiday Camp. He met up with Duck again, and they've been firm friends ever since.

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