NEW HAVEN, Ind. (WOWO): The New Haven railroad line has reopened although what caused the derailment of 31 freight train cars there this week has yet to be determined.
 
Norfolk Southern crews cleared the rail line on Tuesday a few miles east of Fort Wayne. Several of the derailed cars remained along the route where the derailment happened about 6 Monday morning.
 
Officials are searching for any human or mechanical factors might have contributed to the incident. They say lumber and scrap metal was among the material spilled during the derailment. Five tankers usually used to haul chemicals derailed, but they were empty at the time.