Federal authorities have begun their investigation into yesterday's New York City commuter train crash that killed four people and injured more than 60 others.

The National Transportation Safety Board says investigators could spend up to 10 days looking at all aspects of the accident that toppled seven cars and the locomotive.

A spokesman says two cranes are in place to lift the rest of the train once the National Transportation Safety Board gives the OK. The accident happened on the Hudson line which carries about 26,000 weekly riders.