That would solve part of the problem, but there’s an even lower bridge in Dunbar, so further changes would be required to the network.
Yeah you just aren't taking deckers past Haddington nor do you need to from a load factor as far as I know.
So it's a case of:
* X7 peak frequency improvement (pre-covid it was 3 an hour not 2)
* part route X7s with deckers on the peaks
* splitting the X7 into two routes (Haddington and Dunbar via East Linton)
* changing the X6 to be, err an X, not a pretend one like it is at the moment
* Re-timing the X6 (least impactful option but easiest to execute?)
Most of which involve a combination of more drivers, more vehicles, dead mileage or lost coverage on existing routes. No silver bullet unfortunately.
I hope they sort it out, as Haddington has grown significantly as a town and it's easily the biggest town in EC territory without a viable rail link for commuters.