Police have identified a 23-year-old man who was critically injured after being hit by a train yesterday.

Senior Sergeant John Roberts confirmed the man attempted to ride a moving flat deck train carriage.

The man was taken to Middlemore Hospital and has since been moved to the intensive care ward at Auckland City Hospital.

He suffered significant head injuries and is in a stable condition. The man's family have been notified.

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Police say he tried to ride the moving train at Puhinui Rd Station, near Otahuhu, about 1.30pm yesterday.

"He has received significant injuries and police are working to identify him," Inspector Tony Edwards said.

"The man is of solid build, wearing blue denim shorts, a white T-shirt, white running shoes, a blue cap and is believed to be of Maori or Pacific Island descent."

Anyone who may know the man should contact the Manukau Police on (09) 261 1300.