Amtrak ridership declines for fifth straight month

Amtrak is seeing a decline in ridership as reported by the Detroit News. Ridership on the Northeast Regional trains between Boston and Washington fell 15 percent to 548,695, and passenger loads on the Acela line dropped 8.5 percent to 263,970. Travel is down across all forms of transportation due to the recession so I don't think too much can be read into this. It'd be nice to know how this drop in Amtrak ridership compares to car/bus/air travel.