https://www.realtimetrains.co.uk/service/gb-nr:71123/2024-05-07/detailed
5T60 Southport to Kirkdale appeared in real-time train, think this is the first half of 507 011 and 015 heading to Birkenhead North for scrap preparation.
Expect a 5T61 Kirkdale to Birkenhead North to appear at some point...