NEW YORK (AP) Federal authorities have issued an emergency order instructing a commuter railroad to make immediate changes after a train derailed this week, killing four people.
The Metro-North Railroad was ordered to modify its signal system and put extra operators on lines where there are major speed changes, like the curve where the passenger train derailed Sunday.
The order said immediate changes were needed to make sure train crews don't exceed speed limits.
A commuter train went off the tracks Sunday after an engineer hit a curve at nearly three times the 30 mph (48 kph) speed limit.
The train operator told investigators he fell into a trance, or nodded off, at the controls.
The Metropolitan Transportation Authority, which oversees Metro-North, says it will comply with the order.