ill let them know later of your idea.

maybe you must make a hangar with magnet for storing the train at station and save it inside

No, this was from a WORLD save. every thing is prebuilt in it. Just is that you spawn on one side of lake. and train is on otherside. So some times the blocks dont load for track. but train loads and starts to move.

fixed how? you meant it not hapended when you build it first but when you reloaded the save?
maybe their is trick to avoid it

oh this isnt my train. I posted it so guy would see what was happening. This issue was due to blocks loading for track slowly. And rain would fly out into air before track spawneed when joined the world. its fixed now.

i mean one single wheel at each extremity and on the 4 axis of the wagon

single would tip over 100% of the time then.

dual wheels seem not smart maybe single behave better