Catacombs Model Gallery
The Infernal Machine Tanks

Tanks from The Infernal Machine. They are also briefly glimpsed in The Last Enemy (the "This Episode" sequence) and Space Warp (in the Eagle hangar). There were three different designs made. You can see sketched plans of two of the vehicles and a detailed discussion in the Catacombs.

This tank, with inset windows like the Eagle, is the most recognised of the three designs. More pictures.