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Alan,
In the Aug 2007 Model Rail mag NO.107, there is a write up about the Fell Locomotive No. 10100. It was tested on the Settle & Carlisle in April 1955 and had a 4-4-4-4 wheel arangement. The center drive wheels had a coupling rod but were linked together by an internal gearbox. This ment that the coupling rods never went out of synchronisation with each other. The loco was scrapped in July 1960 at Derby works.
Syd
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