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Chicago • A railway says it has implemented new security measures at a Chicago rail yard where thieves stole 150 guns in recent years, most of which ended up in the hands of drug dealers and gangs.

Norfolk Southern wrote in a May 4 letter to U.S. Sen. Dick Durbin that among the measures it put in place for the South Side yard as of April 1 are rules requiring better train-cargo locks.

Durbin had written to the railroad on March 14 in response to an Associated Press report about the guns that were stolen from its rail yard, which he said jeopardized the public's safety.

The Senator's office provided the railroad's letter of response to the AP this week.