You will need to loop over each of those. For each one, access the hidden property SegmentContainer.Children. That will be an array of objects. Each of the Children has a Head property that tells you how much of the data is used. There is an XData and YData and ZData property. ZData will NOT be empty for 2D lines.
The outline is that each animatedline divides the data into a series of fixed length segments. Each segment contains part of the XData, YData, ZData, and how much of the segment is used is recorded in the Head property.
I did not investigate the case of maximum length where it has to drop items.