Salty is a dockyard Diesel who works at Brendam Docks.
Salty, the Dockside Diesel, is a hard working engine who loves to tell tales of his life by the sea. He will occasionally work in the quarry and other areas on the island, but is happiest down by the docks. Salty is a little rough around the edges but has a great big heart and will always rush to the aid of any engine, be it Steamie or fellow Diesel. 
In the 15th season, Salty told Thomas that a fog would be rolling in and he would be trundling to the Dieselworks and Thomas thought that a monster that Salty was talking about was true and he set out to find it.
Salty is easy-going, friendly and very practical. He also enjoys telling stories revolving around the sea and fantasy. His seafaring ways and accent are sometimes ridiculed by the other engines, but his usefulness almost always helps the others overlook that.
BasisEditSalty is based on a BR Class 07. The number he has, 2991, is a real BR number belonging to a member of the class; this locomotive escaped the cutter's torch by becoming a static generator at Eastleigh Railway Works and is still working there, now under the ownership of Knights Rail Services as of March 2007. This class of locomotive worked at Southampton docks, where they replaced the older Southern Railway USA Tanks (Rosie's class).
- Keith Wickham (UK/US; Misty Island Rescue onwards)
- Salty differs slightly from a real BR Class 07: real Class 07s have a crankshaft at the end of their siderods. Salty is missing this feature.
- Salty's model is currently on display in Canada at Nitrogen Studios.