Apart from the Beyer Garratt (LNER Class U1), they were all a bunch of experiments and/or failures. The Fell diesel proved only that 2000 hp was too much for a mechanical transmission on a locomotive. (using technology existing at that time.). It probably spent more time in works than in useful service.
The U1 was used as a banker on the Worsborough Incline, until the route was electrified as part of the Woodhead scheme. I seem to recall it was then tried briefly as a Lickey banker, but they then decided to use a 9F 2-10-0 instead.
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