The railroad said it was the final and most complex of six capacity improvement projects in northern Virginia to handle more trains at higher speeds.
Funded by $43 million from the Virginia Department of Rail and Public Transportation and nearly $20 million from Norfolk Southern, the projects:
' Lengthened or built new passing tracks between Manassas, Va., and Front Royal.
' Installed five miles of double track near the Virginia Inland Port.
' Improved signal and traffic control systems, and increased train speeds through Riverton Junction near Front Royal.