Wartime pill boxes told the tale of an armoured railway.
I grew up near Chattenden & my schoolfriend lived just behind the station. The branch line led to the railway depot and at the other end of the platform there was a water tank from the days of steam.
There is still some track in situ between Chattenden and the site of Four Elms Hill Bridge. How it escaped the scrapmen I do not know. The area is now scheduled for a housing scheme and I doubt the old line will be so lucky when the developers arrive.
I have found this junction on a OS 1,1,250 map dated 1944-67.
You can clearly see the signal box (SB) in the middle and the signals (SP) each end.