MKC-Princes Risborough services though would be driven by the gap available on the WCML, which would then drive (and import delay) into the Chiltern timetable, which also needs flexibility to work with the Met and other chiltern services at Marylebone. It's a classic 'looks good on paper' idea that then quickly comes up against more issues than it'd be worth the moeny to solve.Might that no longer be the case now the branch is a shuttle, though? It can take an hourly service and isn't constrained by much else at that end as it runs into the bay at Risborough and Aylesbury has more platforms than it needs. I suppose you could end up with poor connections onto Chiltern, though.
Running times of 45 minutes are quoted on EWR.Running time is about half an hour to MKC, so three diagrams. I guess that probably means two 4 car diagrams and one 2, probably shouldn't be too hard to time those so the 2 isn't on any peak services (i.e. the diagrams are such that the two 4s leave both ends on the services departing closest to around 0800 and 1730). Though I do wonder if it'll end up being something else if Chiltern is going to operate it, as something already in their fleet (e.g. 170s which are near identical to 168s) would be easier if they can get them. And it is I suppose possible they'll just operate three pairs and swap the units round with Tyseley units for maintenance as the Marston Vale historically did, at the risk of short-forming in the event of a failure.
So four diagrams for a 2tph service. Either all 2-car with 1 spare and 1 on test/at Tyseley, or Provision for the busiest diagram to double up and if a unit needs a day in the shed they'll just cut the doubled service.With EWR, these journey times would be cut to 45 minutes from Oxford to Milton Keynes and would take 35 minutes between Bedford and Cambridge.*
Plan has always been Oxford-MKC, it's sometimes been slightly confused as the EWR infrastructure works don't go beyond Bletchley, but the trains definitely will.So are there Oxfords going through to MKC then ? I was under the impression it was the Aylesburys that would go to MKC and the Oxfords would turn round at Bletchley.
You are nearer to the action so you obviously be more clued up than I.
* https://eastwestrail.co.uk/benefits-of-ewr, see 'Cut Travel times'