"NR needs to get it's collective finger out, crossrail is supposed to start in 2018 (allegedly), and the two schemes are linked, or should be if they're not."
that's not how they work they'll finish the electrification (with all the attendant delays) for CrossRail to Reading (noticed the GWR wires are starting to go up between Didcot & Reading at last)
then when it's opened they'll start digging up Langley for 2-3 years to get the delays back into the system