When did the last train travel down that line ? And where was this photo taken ? I would hazard a guess and say between Duke street LC and Wallasey bridge road LC looking at the quail track plans book.
That looks like the cutting through the town centre, so the photo was likely taken from Adelphi Street bridge.
Docks traffic finished in 1993, but wouldn't be surprised if a tour got it in shortly afterwards! It's been overgrown for as long as I can remember (lived around there 91-08, and still pop back occasionally) and I'm pretty sure a lot of rails are missing or have been tarmacked over now, particularly around Corporation Road and Wallasey Bridge Road.