Sure , it save approximativly 250Mo for the most use of them.
I don't have time to check it now, but for sure it save a lot of memory..
Thanks for the trick and now i'll use it everytime for sure!
Another question maybe, does Railclone load in the scene part of railclones objects even if we don't use them?
For example, if we have a conditionnal function, sometimes segments are not use, so, are they loaded??
If yes... it could explain why my scene is so heavy... i've a ton's of options on railclone object for construction...