I came across this photo (see below) on the Mersey Railways group of Facebook and it is credited to Phil Hughes:-
At this point the Southport & Cheshire Lines Extension Railway and the Liverpool – Ormskirk – Preston Line paralleled each other between Aintree and Old Roan Stations. The other line can be seen behind the crane removing the Cheshire Lines bridge.
What I don’t know is the date when the bridge was removed – 1960’s?
Click on the photo to enlarge it