Longer travel times are looming for commuters in the Garden State that use NJ Transit.Amtrak has started working to replace concrete rail ties on the Northeast Corridor. The repairs mean that one of four tracks will not be in service.NJ Transit released new schedules that reflect the loss of 25 percent of capacity for the Northeast Corridor. A spokesman for NJ Transit says the number of trains will be cut mainly during off-peak hours.The changes will affect those on the Midtown Direct, North Jersey Coast and Raritan Valley lines.The repair work will be done into the fall and may last until 2009.NJ Transit