THE BRONX - Service is completely back on track along the Metro-North's Hudson Line following Sunday's deadly train derailment.

Commuters are returning to the Spuyten Duyvil station for another day after service was partially restored Wednesday for the first time since a train jumped the tracks, killing four people and injuring more than 60.

Crews completed reconstruction of the second of three tracks damaged by the accident, laying out about 1,500 new tracks, ties and running rails, and completing signal repairs. They say work continues on the remaining track, but that it won't impact service.

Riders were relieved to be able to return to their normal commute so quickly, with many saying they’re surprised by the quick turnaround.

The National Transportation Safety Board is meanwhile continuing its investigation into why the train was traveling 82 mph when it should have been going 30 mph around a sharp curve.

A lawyer for the train's engineer, William Rockefeller, has described what his client told him about the moments leading up the crash, saying he "dozed off" at the controls.