KMLer create kmz file from ArcGIS layer with >320000 lines (near 1.5 hour on my "middle" computer).
Result distributed and placed into forum Transportation.
http://bbs.keyhole.com/ubb/showflat.php/Cat/0/Number/319758

KMLer create kmz file from ArcGIS layer with >520000 points (near 1 hour on my "middle" computer).
Results distributed and placed into forum Education>Tools and Transportation.

Europe. Railways.
http://bbs.keyhole.com/ubb/showflat.php?...&PHPSESSID=