Thanks for the answer, I installed the update and activate Hovercraft mod again. The problem still occur. Maybe it is tricky. I have over 150 mods running. I am playing with the Neotix lamp (R-50) several years. No problem at all. After installing Hovercraft the ground lamps (also installed between the rails) will be damaged when a train is driving over it. Of course I can give you all my mods list but after deinstall the hovercraft mod, there is no problem at all.
In advance,
Waldo
(ps, how can I attach a file so I can show it to you?)