The Sunak notion when he cancelled HS2a/b was that the money would be spent on other transport priorities which would be delivered quicker - "Network North".
This included action on bus fares, potholes and a rigmarole of minor local transport improvements countrywide.
Some of those projects have already started - ie the money is already being spent.
Before the new DfT pronounces on HS2a/b, it will have to review "Network North" and decide how to deal with the promises made for that programme.
I think Louise Haigh and Rachel Reeves will take their time to decide if and how to progress HS2, while at the same time not doing anything stupid such as selling off land earmarked under the existing legislation.
I'd have thought the Autumn Statement is where we might find some initial answers, but the big numbers will have to wait till the next spending review.
The King's Speech at the opening of the next parliament might also give some clues.
HS2 Phase 2a was supposed to be costed better than phase1, because it is mostly on the surface with more measurable contractor costs, and no stations.
The aim was for some of the contracts to be across both phase 1 and 2a (eg the railway construction), with economies of scale.
That isn't now happening, thanks to Sunak - and Phase 1's railway contracts still haven't been let.
There's bound to be a big investigation of HS2 costs, before any major new contracts are let.