Check out this making-of on RebusFarm's website by Bartek Muczyn who used Forest Pack and RailClone for this amazing image of 'Mighty Gagarin', an St 44 model locomotive and one of the most powerful trains in Poland. 

We were pleased to learn that Bartek used Forest Pack and RailClone extensively to create this scene. Everything from the train carriages, the cables. embankment, tracks and more were layed out using RailClone. And of course, all the foliage was created using Forest Pack which was built up in several layers including 3 sizes of trees and many types of ground cover including  ferns, moss, mushrooms, pinecones, weeds, grasses, pine needles, and bushes

You can see the extended information here: More info