An observation....
On this map
https://traksy.uk/live/M+37+LEWIVLJ+21/M+18+NUNHEDJ
Just to the east of Nunhead, a line branches. off towards Lewisham, and the first 4 track sections are shown on it.
View attachment 162521
And clicking on "T/F Lewisham Vale Jn" takes me to this map
https://traksy.uk/live/M+18+NUNHEDJ/M+37+LEWIVLJ+21
View attachment 162522
It's never quite clear what those 4 track sections on the first map represent, because on the second map there aren't really 4 sections in a row like that; there are two junctions in amongst the first 4 sections on this map.
But also, they quite often don't seem to match up in terms of which have trains in them, and trains quite often "disappear" in this section before re-appearing. Additionally there are sometimes glitches in how the train codes are reported, for example my first screenshot above is from this afternoon and one section is marked *X** which normally represents a block on the line but that in fact was (I think) train 6V04 which then started showing correctly once past Nunhead:
View attachment 162523
I realise much of this might be outside of Traksy's control... but as far as the map design is concerned, it would be nice if it was clearer what those first 4 track sections on the line diverging to Lewisham actually represented.