Hi Dragan! The pivot used is the RailClone object's BUT there's a difference in where A2S and L1S generators are created in the scene when no splines are used to define the size of the array.
In the case of A2S Generators, the array builds using the RailClone object's pivot as a starting point.
In the case of L1S Generators, the array builds using the world origin as a starting point.
I'll talk to the developers and see if we can get the L1S to behave like the A2S.
Thanks for reporting it.