There used to be a large contingent from the DC area who traveled to DH via the Crescent, though I don't know how many still do. Great ride, great service, great food, lousy scenery. (Dormant kudzu--YEAH!!!) Unless you have made arrangements to be picked up in Slidel, you may want to consider continuing to New Orleans, catching a cab to the airport, and taking the shuttle from there. Taxi to the airport should run around $25. I think that's a flat rate set by the city. By the time the train arrives in Slidel (assuming it's on time), there's a good chance the sidewalks will have been rolled up.
Later,
K
Later,
K