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Hi Emma.
I'm no expert, but I find railways fascinating including the engineering achievements. There are plenty of major feats of engineering, but a lesser known feat was how George Stephenson tackled the problem of laying a railway across bogs (without them sinking!) He first did this on the Liverpool & Manchester Railway in 1830 when he crossed Chat Bog by using sheepskins filled with some sort of ballast, dropping these into the bog and then floating the line across the top. He used the same method at Fen Bog on what is now the North Yorkshire Moors Railway (NYMR) 5 years later. As I've said, I'm no expert, but I'm sure if you got in touch with the NYMR, someone could give you a lot more detail.
Hope this is useful & good luck with the series.
Tony
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