Shocking footage has emerged of the moment a Queensland Rail tractor crane struck a woman crossing the road in Brisbane and then left the scene as she lay on the road with critical head injuries.

The video, posted on Twitter by 7 News Brisbane, showed the moment the 27-year-woman began to cross the intersection of Hamilton Place and Campbell Street, Bowen Hills, about 1am.

The footage shows that within seconds a yellow tractor crane turns the corner, runs over the woman and appears to continue driving.

A car that turns the corner shortly also appears to come close to hitting the woman, who was left on the ground with critical injuries, but the vehicle stops in time and pulls over.