Since all the cars headed south are loaded at a single location (Lorton) would it really be that difficult to load the cars that would terminate at JAX on car carriers attached to the back of the train and simply uncouple those cars in JAX and unload them after the rest of the AT has departed. Car carriers could be added to the northbound trains the same way.
Have you ever driven from Jacksonville to Sanford? Google Maps may show it as 2 hours - but, with traffic it takes longer than that in actual practice. In addition to adding a minimum of two hours to the trip of anyone coming from the panhandle who would like to use the AT, it also adds considerable time to any who may come from the Savannah and Brunswick area as well as there being are Navy Bases in Jacksonville and Kings Bay, Ga.
I agree, it would take some planning and revisions to do "enroute switching" and I doubt Amtrak would experiment with it either - it was just a thought just like having additional AT's elsewhere in the system ... as has been mentioned by others.
Of course, the what the AT does may not have any impact on the food service of the western trains so I guess we should get back to discussing those
