Pittsburgh line clearance project

Anyone have details on the clearance project through downtown , what bridges, signalling, etc that will be replaced or upgraded to allow the stacks on the main? Any indication for start time?

http://www.nscorp.com/content/nscorp/en ... jects.html" onclick="window.open(this.href);return false;

Here is a link to the NS sight which nicely explains the project and identifies the areas that need to be raised or lowered