Not being familiar with the route though, and given the overall DMU shortage, it did strike me that it was odd to run Barrow - Manchester airport with so much under the wires. Wouldn't it make more sense to split the service at Lancaster or Preston to free up DMUs for diesel only routes? Unpopular with airport passengers of course, where a through train is especially helpful - but 80% plus people on my train were not going to the airport, though that might change with different times of day.
That said, Windermere will hopefully be electrified soon, and so I can kind of see your point that it might make sense to truncate Barrow back to Lancaster bays (and change it to be a fully clockface hourly service) and run hourly through from Manchester Airport to Windermere using a dedicated fleet of 4-car EMUs with extra luggage space and half a coach of First Class. It is also my observation that trains from Barrow almost completely tip out at Lancaster, are very quiet between there and Preston, and then pick up a load of passengers at Preston for Manchester - so it is really two distinct flows.
I see that you've done your Maths, Bletchleyite, it would indeed take a four-car EMU running every hour to provide the same total capacity as a three-car DMU running (up to) every forty-five minutes.
I think there are three issues here, which aren't necessarily related.
1) Electric v diesel v bi-mode;
2) Forty-five minute service of three-car MUs (with only one train every three hours continuing south of Oxenholme) v hourly service of MUs with every train continuing south of Oxenholme;
3) The balance of trains running to/from Barrow and to/from Windermere.
I don't think the latter idea is in any way dependent on electrification. A four-car 769 or a four-car 195 set (2x 195/0s) would provide the same capacity as a four-car EMU, and, at least over the electrified section, a 769 would provide the same acceleration. A 195 set would come close too, I'm sure.
Passengers travelling locally between Oxenholme and Windermere would be unlikely to welcome the reduction to an hourly service, but the better-than hourly service doesn't currently last all that long anyway, and I don't think people can really complain about an hourly service, given the constraints of the single-line.
On Sunday morning I travelled on the 1241 Manchester Airport to Barrow from Piccadilly to Lancaster, and it certainly didn't almost completely tip out at Preston, in fact I don't think there was much of an overall change at all, the same at Lancaster. On the other hand I have mentioned elsewhere that a majority of the passengers arriving at Preston on the 1933 ex-Airport were terminating their journeys there (or, at least, weren't continuing on the same train) but, while certainly more than half, I wouldn't have said that it was the 'vast' majority who weren't continuing. It's probably heavily dependent upon time of day.
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