Androzani harvester

The Androzani Harvester was a three-legged machine that was used by the Harvest Rangers to collect trees. When harvesting a living forest, Droxil, Ven-Garr and Billis travelled in one. Madge Arwell then used it to reach her children, Cyril and Lily. It crashed and was too badly damaged by acid rain to repair. (DW: The Doctor, the Widow and the Wardrobe)