They are basically a 150 with a pantograph. ...
Apart from being 4-car, powered by diesel electric traction system, have a higher permitted top speed, have more luggage space ...
... They would be totally unsuitable for Barrow, Windermere or other longer distance services. There is far more to a train, from a passenger's perspective, than what powers it.
That's true for all trains, for instance their order of importance might be:
they are there to turn up at all
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they are safe
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they have enough space for the passengers wishing to board
they make more or less noise when running
they pollute more or less in service
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they are more or less comfortable
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and at the bottom of the list, they have lots of other characteristics that some here claim are important like windows that line up with seats, collectable numbers, weren't "London's cast offs" and so on.