Shelbert is a freight engine who works on The Transportonian Main Line. Sometimes he's a tender engine. Other times, he's a tank engine.

He's a cheerful little engine usually, but becomes a real worrywart if he’s even a few minutes behind schedule. And if he goes too fast when trying to make up for lost time, he tends to get himself into serious trouble.

He's also known to be very ticklish when he gets a maintenance checkup or getting repaired.

His voice source is Jeff Bennett.