Are you really surprised? We’re talking about Amtrak and CSX. Both will do what’s easy, not what‘s best for the passengers. But your probably right that crew availability for pilots on a detour move was a factor.I'm surprised Amtrak didn't opt to detour the trains as there were two detour routes available that would have been only a three-four hour delay instead of these massive ones.
Since it appears there will eventually be funding for the former Seaboard mainline restoration Petersburg to Raleigh, I wonder if that shouldn’t become the preferred route for Silver Service. That would improve service to the two state capitals, Raleigh and Columbia. The Palmetto on the A line (ACL) could be scheduled to provide connecting service for Charleston, also a significant market. Or perhaps a new connecting train on NS Charleston to Columbia in the unlikely event SC contributed to funding. It would have been great to see Auto train go through Camden and Columbia.
Another big benefit of the SAL route is minimal freight traffic with just a few local freights. In the 60’s the Seaboard and Atlantic Coast Line competed on this market with Richmond to Jacksonville on SAL being about 35 miles shorter than ACL but about 45” longer because of more curves and moderate grades. But today’s LD passengers are little concerned with such nuances. They just hope to get there on the right day.