The Industrial Terrain from GrimDark Terrain is compatible with 6-8 mm Epic Sci-Fi games. It fits perfectly into your terrain. Whether Warhammer 40K or other sci-fi tabletop games, it simply fits many settings.The Promethium Macrotainer Wagon for the Land Train consists of 4 parts and measures 36x38x44mm.The wagons can be connected with magnets, so you can remove or add wagons. You need 4 round magnets with a diameter of 5mm and a thickness of 1mm.A great extension for the Land Train sets, which you can find here:
Titanicus Civitas Land Train Empty
 Titanicus Civitas Land Train With Cargo
We have many other terrain models and also Greebles/Bitz on offer. Just have a look around.