The cracks were discovered because Amtrak was testing whether it could raise the speed limit slightly in New Jersey on curves between Trenton and Newark .
New Jersey /location/location/contains Newark
New Jersey /location/location/contains Trenton
DT NNS VBD VBN IN NNP VBD VBG IN PRP MD VB DT NN NN RB IN NNP NNP IN NNS IN NNP CC NNP .
New Jersey
LOCATION
Newark
LOCATION
/location/location/contains
New Jersey
LOCATION
Trenton
LOCATION
/location/location/contains