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In page GNR Class C1 (large boiler):
"The C1 Class, as it was known under both GNR & LNER classifications, was designed by Henry A. Ivatt as an enlarged version of what became the LNER C2 Class. The principle of the design was to produce a powerful, free-steaming engine to haul the fastest and heaviest express trains on the Great Northern. They could thus be seen as the start of the East Coast 'Big Engine' policy. None were ever named.
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