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.You can connect the freight wagon to the train and other wagons with the help of magnets. You need a total of 2 round magnets with a diameter of 3mm and a thickness of 2mm.The Bulk Freight Wagon has the dimensions 58x23x23mm.A great extension for the Heresy Train Starter Pack. You can find it here:
Heresy Train Starter Pack
We have many other terrain models and also Greebles/Bitz on offer. Just have a look around.