I'm not sure that is the case. Had GC or Alliance been given the go-ahead the shortlisted companies would have known exactly what competition they faced and tailored their bids accordingly
...but (even if they know what paths are allocated today) they wouldn't know what paths may be allocated to OA services over the next decade or two.That's what I'm getting at.
You're asking a company to make a commitment to a bid lasting a generation, asking them to specify what investment there will be in additional trains/ additional services, without knowing whether some of these flows will be diluted (in the way that GC took a share of the London - York market a few years ago).
Its not like running buses, where there's no commitment to maintain minimum service levels for twenty years, and no restrictions on "pathing" services".
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I'm not sure Preston-London is a busy market compared to the other WCML flows and the fact that Preston only has 1tph to London doesn't seem to fit in with it being a key market for the WCML franchise.
Not the busiest, but still a busy one. It gets more London services than Glasgow after all. Plus any OA service will either stop at more WCML stations further south (either eating into ORCATS money or abstracting existing passengers).
Would you make a competitively priced bid to last a decade or two (with the danger that your sums could be compromised by seeing some of your flows to another company)?