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 crossing to the other track parts with the help of magnets. You need a total of 4 round magnets with a diameter of 3mm and a thickness of 2mm.The crossingmeasures 90x90x10mm.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.