Jem Cole is Trevor's and George's owner and is a good friend of the Vicar of Wellsworth. He dresses in typical farmer clothing with a brown fedora, a red vest, white button down shirt, and brown trousers and black rubber boots.
Jem, along with Farmer Trotter and others, was a part of the rescue team which found Duke. He seems to be very knowledgeable about road steam traction, as he has also driven George. Jem Cole is a skilled mechanic, as he restored Elizabeth. As of the eleventh season, he appears to be working as a farmer and has grown a grey beard. In the fifteenth season, he was seen fishing with a little boy in the Whistling Woods; this could possibly be his son or grandson. In Day of the Diesels, he helped to extinguish a fire at a barn. In the sixteenth season, he helped to put out another fire, this one at The Fat Controller's Shed.