(20 Jan 2022, 4:33 pm)Andreos1 wrote The one that jumps out to me, is the line which went to Phili Depot and had the spur with the Leamside line at Elba Park.

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Intrigued about that collection of lines near Frankland Prison. 
Can vaguely remember some concrete buildings in that area, but can't remember what they were for. 
Didn't know there were any lines there at all.

The concrete buildings was the Ministry of Supply Brasside Munitions Depot set up to supply the Royal Navy during world war two. The site had 24 concrete storage bunkers and ancillary buildings with a spur from the main railway network. Apparently the link to the main railway network was removed during the building of the prison.
The site covers a huge area and can be viewed on youtube from a drone survey uploaded by John Twist.