In a bi-party exchange of comments, I then drifted slightly off topic and allowed my fingers to start typing words relating to line speeds. I apologise for such a display of utter geek-dom. Regrettably I am unable to promise that there will not be a repeat of something similar.
Anyhow, here is a repeat of my comments relating specifically to the replacement crossover:
The purpose of replacing the points north of the station is to increase the Up (London bound) line speed through the station (through platform 3).
This has been done by 'de-prioritising' the points, reducing the Up to Down line line speed across the points (into Platform 2) from 40 mph to 25 mph.
This picture [click it for a larger version], taken earlier this evening shows the new points. The Up Line (towards London) is on the right, while the track on the left is going towards Princes Risborough & Birmingham, with trains traveling away from the camera.
The points were replaced at some point during the last eight days. While I do not have 'before and after' pictures, I can tell you that the previous crossover followed a straight line whereas the new points have a very obvious kink to them. That is why I described the new crossover as 'de-prioritising' the points.
Trains can now travel much faster into High Wycombe station, however to cross-over from the Up to the Down line, trains can only now travel at a maximum 25 mph.
There are literally dozens of seemingly innocuous pieces of engineering such as this built into the Evergreen 3 project. Each one is safety critical, each one probably incredibly expensive and each one contributing to the journey time savings that many passengers will hopefully see from next week.
I am not a mouth piece for Chiltern Railways. While I hope that all goes well with the launch of the new timetable, many commuters are expressing disquiet about the number of trains due to stop at their stations.
The railway company is hoping to deliver shorter journey times and more seats, this is at the cost of fewer trains at some stations. What this could mean in practise is that commuters have less flexibility as to the timing of their journeys. Only time will tell - I hope that I am being overly pessimistic as to the impact of the new timetable on Heartlands commuters.