Long Island Rail Road officials say they?re checking their equipment after the latest warning stemming from the investigation of a D.C. commuter train crash.

Nine people were killed in the June crash. National Transportation Safety Board investigators believe a failed sensor system may be to blame. The NTSB is telling all U.S. rail systems that use the same signal system as the D.C. trains to make sure it works.

LIRR says it uses a similar system but only as a backup.

"We are reviewing the NTSB report and are going to contact the manufacturer of our equipment to make sure the issues in Washington are not impacting our system,? a LIRR spokesperson adds.