A police officer involved in re-investigating the death of Gomeroi teenager Mark Haines has told an inquest he's always believed someone was involved.

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Mark Haines was 17 when his body was found on train tracks just outside Tamworth in northern NSW in January 1988.

Police found a stolen car next to the rail line, which appeared to have crashed and rolled.

Mr Haines' family never believed the findings of an initial police investigation, which ruled the 17-year-old had lain on the tracks either deliberately or in a dazed state after a car crash.

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