A man who reportedly jumped from a runaway rail truck last Thursday has died in hospital.

The man was employed by Udy Contracting to work on a section of rail line between Westmere and Whanganui.

The company said the man died in Wellington Hospital on Monday.

"Our thoughts are with his whanau, friends and colleagues ... " business manager Kerri-June Clayton said.

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"The company is co-operating with investigations into the incident."

A senior Whanganui fire station officer said last Thursday that the man had broken his leg after jumping from a rail truck which had a brake failure. The truck had travelled about 3km along the track and the man had jumped off after about 2km, he said.

Upper Hutt-based Udy Contracting specialises in railway maintenance.

A WorkSafe spokesman said it was advised of the digger incident in Whanganui last Thursday.

"The initial notification to WorkSafe advised that a worker had lost control of a digger truck and jumped from the vehicle, sustaining a broken ankle. After reviewing the circumstances surrounding the incident, WorkSafe requested the construction company that engaged the contractor to undertake a duty-holder review." The spokesman said WorkSafe was then told the worker had died. "WorkSafe is now making inquiries to ascertain whether the cause of death is related to the incident."