A criminal investigation has been launched after the post-mortem on the newborn girl showed she had been born alive and had been injured.
She was found wrapped in towels on the ground of a garage complex by a man who went there to collect his car on Friday morning.
Detectives are still evaluating witness statements, but have been unable to figure out where the baby came from – or get any information about who her mother may have been.
A police spokeswoman said the autopsy showed injuries on the baby, but no conclusions could be drawn on where they came from.
Investigators are not ruling out the possibility that the baby could have been thrown from a passing train, as a track runs right next to the garage.