Plant Wagons, also know as Bolster Wagons, usually carry long objects like logs, girders, and pipes, although they were once used to carry saplings to the forest for planting. They were once also seen filled with scrap.
They first appeared in the second season episode, Duck Takes Charge, they had also made several appearances in the fifth season. In the New Series, plants and logs were carried out on Flatbeds and Wellwagons. They appeared frequently after that, but have made more frequent appearances in the CGI Series.
The plant wagons are based on narrow gauge Lynton and Barnstaple Railway bogie goods wagons scaled up to standard gauge.