With introduction of Super Express services not due to start until December 2017 on the Western region and the following year on the East Coast Main Line, it's a little early to be getting any precise details on IEP timetables.
We can get some idea of likely timetables from existing First Great Western and Virgin Trains services, though clearly there will be some major changes.
The new IEPs are intended to improve speed and availability across the board, so we will definitely see changes in times and run rates compared to those already running. Reductions in travel times can be expected across all major routes.
When details of any new train timings are released they'll be reported here, broken down into peak time and off peak. We'll aim to build a comprehensive picture of timetabled services through all the stations out towards the western and southwestern UK region, and upwards towards the North along the eastern side of the UK.
For now, check out the IEP news page for progress on the IEP introduction programme, or visit the routes page for information on where the trains will run.