- Bill Nighy - Thomas the Tank Engine, Thomas the Tank Engine: Video Game, The Magic Railroad: Video Game, The Narrow Gauge, The Narrow Gauge: Video Game & The Pack
Thumper is a quarry machine with two arms and catepillar treads. He is designed for loosening rocks. Thumper is not based upon any known quarry machine - at any rate, a machine of his type would be extremely hazardous to those around - such as the lack of windows at the front of the cab, making the operator unable to see. Thumper is painted orange with his name painted on his side of his bonnet in whit .
Thumper is a "cool man" and thinks that no job is too big for him, something that P. T. Boomer takes advantage of.