About 1am this morning, a CCTV camera from a nearby bar, shows the 27-year-old woman walk across Hamilton St at Bowen Hills, before being struck by a large pettibone turning the corner.

It can be seen in the video player above. Warning: graphic content

The driver of the large piece of machinery slows to a halt after the incident, but drives off after the arrival of another motorist.

Police have seized the pettibone, which is owned by Queensland Rail.

The woman is fighting for life.

A 58-year-old man has come forward to police and is assisting them.

The woman is in a critical condition with serious head injuries and has undergone emergency surgery.

Equipment pictured on the pettibone which police believe may be involved in the incident is used in the maintenance of railway lines.

In a statement, a QR CEO Nick Easy said: “This is a terrible incident and my thoughts are with the young woman and her family at this time.

“This is a police matter under investigation. Queensland Rail is doing everything possible to assist emergency services with their inquiries.”

It is unclear if the person driving was a QR employee.

In a separate incident, an elderly man is in a critical condition in the Royal Brisbane and Women’s Hospital after he was hit by an SUV in Windsor.

He was hit while crossing Bowen St around 7pm on Wednesday.