There have been a fair few changes and modifications since I last added to this thread...
Here are just a few:
Screen 1:
Fort Rondtown junction was/is a bit of a choke point. To help fix this the line to the north-east was broadened to 3 tracks (why will become more obvious in a later shot), Fort Rondtown station was made bidirectional, with a new entrance from the north-east, and an extra platform was added on that line for trains heading north-east from the south (about a third of all traffic to the station). Previously trains trying to get into the station had at times hampered those trying to leave (and vice-versa), and with the new north-east entrance, trains from the south were having to queue a long time for a free-platform in the old station.
Screen 2:
The corridor from the north end of Chardham station across to Frafingburg Springs was widened to two tracks each way, with one each specifically for wood freight. This was done due to chronic jamming previously, and also paved the way for some recent developments in the Frafingburg Spring area (in another shot).
Screen 3:
This junction is under development again... Mostly because of a bottleneck for freight entering from the south-east and trains south-east bound from Trudingville (which is slightly overloaded). To alleviate these, another track from the south-east as far as the split between the north and west directions was added, by tunnelling under the oil wells (hmm

). This significantly reduces the amount of congested merging going on just before the junction.
One south-bound line from Trudingville was re-assigned to only carry passenger trains leaving that station, instead of being merged with large amounts of freight, which is now merged with the other 4 lines. (Just off the edge of the shot, might change the screenie later).