She was forced to move with the train, operated by First TransPennine Express to avoid being pulled off her feet, the report by the Rail Accident Investigation Branch said.
The conductor did not see the trapped passenger on the curved-shaped platform because he did not do a final safety check before dispatching the train, the report said.
The train reached around 5mph before stopping after travelling about 20 metres, with the woman – who had been attempting to board the train as the doors were closing – suffering severe bruising to her wrist.
The incident happened at Newcastle Central Station at 5pm on June 5 last year.
Investigators said the doors of the train were in certain circumstances able to trap a wrist and lock without the door obstruction sensing system detecting it.
Once the doors were detected as locked, the train was able to move.
In 2004, although the parties involved in the train’s design and its approval for service were aware of this hazard, the risk associated with it was not formally documented or assessed, the report said.