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.
Salty is painted crimson with pink warning stripes along his body, wasp stripes on his front and rear and yellow buffer beams with signs of rust. At the top of his forehead, he has the brim of a skipper's hat.
In Salty's Surprise, it is revealed that, due to a shortage of red paint, he was once painted green.