Some observations from a trip today between Paddington and Oxford (not my normal patch!):
Mast base count (metal piled foundations): about 65 (on the north side).
Tilehurst-Pangbourne: 17 (starts just west of Tilehurst station)
Pangbourne-Goring: 22 (mostly east of the river bridge)
Goring-Cholsey: 23 (ditto)
Cholsey-Didcot: 3
They come in fits and starts, not a continuous line.
Sticks mark the locations to be piled, some on the Oxford branch.
Reading station area: Masts pretty much complete over all lines from about half a mile east of the station (next to the gasholders), to the middle of the station.
They are then concentrated on the north side as far as the new MU depot, which is partially wired.
Nothing much can be done on the south side until the new viaduct is complete.
There is significant electrification work in progress at the other construction sites: at Acton (new freight diveunder) and at Stockley (airport viaduct being extended onto the relief lines).
But otherwise, nothing obvious by way of electrification work on the main line east of the Reading station area.
Most of the work going on is on a new cable route.
There's a big work site taking shape at Iver, but it looks like it's for track remodelling.
North Pole depot looked to be a hive of activity, and new track is down at the Maidenhead Crossrail sidings.
All the platforms at Reading station are now in use, although some fitting out is still going on.
The London end of new P7 is closed for rebuilding where the old footbridge was, but HSTs can stop further down the platform.
It's a nice station now, but very draughty today (needs some wind baffles for the escalators!).
Picture of Moreton Cutting below, with some of the 12000 piles to be driven into the GW main line over the next 3 years: