Nelson is a ballast tractor.
Nelson is the intelligent, if long-suffering ballast tractor who hauls members of the construction team to and from work.
(The following list only applies to products with the name "Nelson". Few exceptions can also be added.)
- Nelson (TrackMaster)
- Nelson and Byron (TrackMaster [HiT Toys])
- Sodor Snow Storm Nelson (TrackMaster [Fisher-Price])