In the entrance hall of Warhammer World is a large diorama of Ultramarines defending an Imperial facility against an overwhelming Necron force, entitled the Mines of Vertigus II.
White Dwarf #456 has six pages on how the diorama was put together.
What interested me was the railway, and this is what the article said about the railway.
The railway is made from the tracks that come on the Tectonic Fragdrill. We used a lot of them! The carts are Munitorum Armoured Containers with their roofs cut off. They were then mounted on the wheels from the Galvanic Servohaulers kit.
Alas due to the glass cabinet and lighting I was only able to make this shot.
More photographs from Warhammer World.