No trains now serve Birkenhead Docks. It is a recommendation to get them back in the docks. As only West Float will be commercial, there is no need to take trains any further - tarisn can get in via Bidston.
From around Cammel Laird there is a disused tunnel that took trains under Birkenhead to Edgerton Dock, however this will be apart of Wirral Waters. I doubt if the tunnel can ever usefully be used again.
When was the last train at Birkenhead docks? Anyone know?