NEW YORK (CBSNewYork/AP) — A preliminary report by federal investigators on last year’s deadly train derailment in the Bronx does not draw any conclusions about what caused the wreck.

The National Transportation Safety Board issued the brief report Tuesday.

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It has no major revelations about what happened when the Metro-North commuter train went off the tracks Dec. 1, killing four and injuring dozens.

LINKS: Read the full report | Photos of Metro-North derailment

The report restates previous findings that the train was traveling at 82 mph on a curve that had a 30 mph speed limit. It also repeats that no mechanical problems have been found.

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Representatives of the train’s engineer have said he may have lost focus at the controls. The preliminary report doesn’t address that issue.

An NTSB spokesman says new information and a conclusion are probably months away.

The accident has fueled calls for improved technology on trains nationwide to prevent future derailments, and federal inspectors are conducting a safety assessment of Metro-North. The commuter railroad also faces lawsuits filed by victims in the derailment.

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