Norfolk Southern determines `urgent railcar safety issue` after loose wheels found on rail cars in second Ohio derailment
(CNN.com US)

Norfolk Southern found loose wheels on a series of rail cars involved in last week`s derailment near Springfield, Ohio, the company has announced, the latest safety problem to emerge as scrutiny intensifies on the operator -- and US freight safety broadly -- following that wreck, a toxic derailment five weeks ago in another Ohio town and a derailment Thursday in Alabama.