The tender engine is actually a 4-6-2 No 666 and not a 4-6-0 - it's a CC class loco as shown on the link below of one of is sisters . . ....
Sadly with such sweeping statements of the kind "she’s the only ya de da . . . " its easy to disprove such - try this page for starters (a barclay...
I would have thought the book by Phillipson would be a good place to start although its a long long time since I've looked at my original copy...
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