In probing the Springfield wreck scene Sunday, the company “determined that a specific model and series of rail cars had loose wheels, which could cause a derailment,” officials said Thursday in a statement, calling it an “urgent railcar safety issue. ”Norfolk Southern announces new safety measures after East Palestine disaster as NTSB probes another Ohio train derailment As a result, the Association of American Railroads issued an advisory to halt the use of these cars until they can be inspected for the wheel sets in question. No waste or leak resulted after the derailment of 37 cars, mostly carrying mixed freight, Norfolk Southern spokesperson Connor Spielmaker said, adding two of the cars previously had hauled hazardous material