Dimensioned tracing referred to can be found at: https://www.alamy.com/express-passenger-engine-the-engineer-29th-september-1871-a-drawing-of-an-express-passenger-engine-great-northern-railway-image-taken-from-the-engineer-originally-publishedproduced-in-29th-september-1871-source-colindale-drawing-48-language-english-image226795167.html
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