The official answer - Chris Heaton-Harris with Mark Hopwood also on stage - is that the investment and business case for it on the GWR▸ mainline is based on an improved (more and quicker journey time) London trains. "The service improvements are the final step of the investment, and without them the investment could not have been made".
I totally get about the improvements to the GWR mainline and how the new
IET▸ services fit into it. However, this is now being introduced totally against what was promised to us for Bristol
The actual promises made with the re-quadrupling of filton bank were both "More trains, more often", and "More local services"
I understand the capacity limitations at both
BPW» itself, and the double line bottle neck between BPW and FIT
However, following the introduction of the 3rd (now platform 4) platform at BPW over 10 years ago, a new cross-city service was introduced running hourly both ways between WSM and BPW. Prior to the introduction of the 4th (now platform 1) platform only a couple of years ago, we also had the regular stopping services on the Worcester / Malvern services coming through on the Yate corridor. There was capacity for all of these services even before the 4th platform at BPW was introduced, which then added even more additional capacity
To allow for the introduction of yet more IET services through BPW (we already have 2 an hour anyway), not only are we not gaining additional local services, we're actually LOSING pretty much ALL of the off-peak local services we already have, and on the Yate corridor this is being reduced to literally 1 per day!
How on earth has this been allowed to happen, and with the promises made for yet more additional local services going forward, how can these possibly be introduced when they're now dropping the existing main cross-city service to cater for the new IET's?
It's one thing not to deliver additional services, but to actually withdraw them from a city that's infamous for being close to gridlocked on a daily basis is beyond madness