Marshall is a Canadian snowplough locomotive.
Marshall was ploughing snow through the Rocky Mountains when he came across Thomas, who was stranded in a snowdrift. Thomas thought that Marshall was a monster at first, but Marshall introduced himself and showed Thomas his rotary snowplough. Marshall then had Thomas back out onto his line while Marshall travelled in front, allowing Thomas to pass through the mountains safely.
Marshall is based on Colorado & Southern Rotary Steam Snow Plow No. 99201, built by Cooke Locomotive and Machine Works in 1899. However, Marshall is self-propelled, whereas his basis is not.
Marshall is painted dark grey with a dark red rotary snowplough and red lining with the number 64 on his cab.
- Like Dustin, Marshall has a much taller cab than his basis; this was to accommodate for his face.
- Marshall is the first engine created for the Thomas' YouTube World Tour videos to be directly mentioned by name by the narrator.