Thanks for the photos itfcfan. I videoed the work from an up train on Line 6 last week, but it was difficult to ascertain what was being put on the ground compared to the track layout plan that I had.
From the first photo, it can be seen that the 3 left side tracks will join the 3 right side tracks in photo 2. The fourth track becoming the Down Crossrail, not yet laid, being in the space between the existing line 6 and the laid track. This track will then take over the formation of line 6 until it joins Line 5. Line 6, of course being split in 2 by this work. Line 6 at Westbourne Park, after the connection to the Marcon concrete plant sidings (now also being laid), will become the Up Crossrail (right side line in photo 2). On the Paddington side, Line 6 will rejoin Line 5 shortly after Royal Oak.
Looking into the distance in photo 2, you can see the start of the turnback facility consisting of a single loop, which reconnects with the Down Crossrail prior to it joining Line 5, and 2 sidings.
I assume the work will all be connected up at Christmas, when there is another blockade and Paddington will be shut.
Has the connections at Pudding Mill Lane/Stratford been made yet? As they intend to start testing between Abbey Wood and east of Whitechapel soon, they will need some way of getting a Class 345 into the area, without dragging it round London.
For those interested I found the following PDF by Googleing 'ETCS' and 'CROSSRAIL', which has track and signalling layouts, and an explanation of the transitions between signalling systems.
https://www.networkrailconsulting.c...cbtc-interfaces-crossrail-signalling/download