I found this article dating from October '03 re: NS plans for Enola Yard:
I wonder how much of this plan has come to pass so far?
That study showed that more car sorting needed to be done at Harrisburg than could be done without the Enola Yard in operation, so Norfolk Southern set up a 15-track classification yard at Enola. That increased the number of cars that could be handled daily from 125 to 725.
"Now we're going to do the next phase, and that is to take the 15-track classification yard and automate it so we can classify cars more in an automatic process manner," Brown said. "That's the project we're starting now, and we'll actually go until next summer until it's completed."
The Enola Yard will again become a "hump" operation, where inclined tracks use gravity to help sort cars. Previously, it had been a flat-switching operation that used paper lists and human intervention to get the cars where they needed to go. Brown hopes the yard will be able to handle 1,200 rail cars daily when the work is done
The other big project that is getting under way is the $5 million Lemoyne Connector, a new track that will allow Norfolk Southern trains from Hagerstown, Md., to avoid a circuitous, congested route through Harrisburg to get to Enola Yard. Those trains now must make a right turn onto the distinctive old Reading Railroad bridge across the Susquehanna River, then proceed through Harrisburg and up to the Rockville Bridge, where they cross the river again and proceed south to Enola.