My idea to alter the track layout at Queenstown Road

[ccityplanner12]

Queenstown Road (according to Cartometro & my own observations) currently has a layout in which (going up) the Up fast has a viable platform while the Up slow doesn't; meanwhile in the other direction the down tracks merge into one. This means Up trains have to switch between tracks & run incorrectly (slow on fast, fast on slow), while down services share tracks for a very short section.
1950s maps show a platformless track in-between those for platforms 1 & 2, although its only purpose appears to be to accommodate trap points for freight trains leaving Nine Elms North goods depot.
The layout could be improved by relocating the Up fast & turning the former Up fast into the Down slow, giving an Up slow through platform 1, a platformless Up fast, a Down slow through platform 2 & a Down fast through platform 3.
In a twist to the story, Bing Maps shows the layout aforementioned, while Google Maps (which can generally be relied on to be more up-to-date) shows a stretch of tracks with fresh-looking ballast & a different layout: now, instead of merging with the Down fast, the Down slow merges with the Up fast. This could be a step towards changing to this layout.

 

[swt_passenger]

NR already have proposals to significantly change the layout through Queenstown Road, and it doesn’t involve a four track layout. I’ve got the drawing from the route study somewhere, I’ll add it in a few minutes:

 

[MarkyT]

It's not easily possible to reinstate four tracks through Queestown Rd because there's a bridge support column in the way where the Brighton line into Victoria passes overhead. This additional column was put in as an emergency repair at some time, possibly after bomb damage during WW2, but I could be wrong on that. The column is definitely there however and obstructs the alignment.

 

[MarkyT]

Also I wouldn't get too hung up on the line designations on the Windsors as in the down direction fast trains heading for first stop Richmond after Clapham Junction normally run on the Down Windsor Slow all the way to Barnes. This is to reduce conflict with Hounslow services, which are mostly stoppers, at Barnes. In the Up direction however, the fast trains use the Up Windsor Fast, again because it reduces conflict at Barnes with the Hounslow stoppers. I expect once the additional platform as illustrated is provided at Queenstown Road, the up stoppers will use that normally while up fasts can pass them via the Down Windsor. Meanwhile a down Windsor train (whether fast or stopping) would use the Carriage Line to weave around that. Once the requisite CP5 connections shown are in place other simultaneous movement possibilities could also take place.