When I arrived at Cambridge last night, Greater Anglia had organised separate taxi queues outside the station for Littleport and each station beyond (not Waterbeach/Ely since, as you said, GA/XC were still serving those stations). I don't think they'd have been organising taxis like that if a shuttle service was running!
Well, indeed. These 'shuttles' they always mention will rarely, if ever, materialise in the real world.
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Staff there had just ordered 30 taxis for Kings Lynn and intermediate stations as they'd been informed that the next few 'shuttles' were cancelled. So I don't think the shuttles were running.
It does strike me as somewhat astonishing that it is accepted as 'normal' now that Kings Lynn gets no service when there are issues at the London end. Good on the one hand that taxis are arranged, but I'd really rather my fares were paying for a service rather than endless taxis all over the Fens. Especially when GN have just put their weekend tickets up 11% - I wonder if their taxi bills are related to that.
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I was looking at signalmaps and I think that's exactly it. There was no capacity for trains at Cambridge as they left trains abandoned in the platforms, so they had to be held at stations before, like Foxton and Royston
That may have been the case earlier (and I've certainly seen it happen before) but didn't appear to be an issue when I found myself at Cambridge around 1845. 1, 4 and 8 were all free; 7 had a (very) delayed Thameslink service but that moved off while I was there.
Possibly the signaller had been bitten by abandoned trains blocking platforms earlier, and so wasn't letting anything that would terminate at Cambridge off the branch until 7 was clear? There were a couple of Thameslinks stuck on the branch with the Kings Lynn services sandwiched between them. In that case though, surely the 1T services ought to have got priority onto the branch into the first place, rather than having Thameslink terminators delay everything?
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Here's the latest 4-week rolling average:
Lovely.
I note that on Friday (when I wasn't travelling, of course) all these 8 services were on time (!!!). So it seems that the timetable *can* work if all the stars align correctly, just that they usually don't.