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I think the first of the two branch lines that left the GWR Ruabon to Barmouth line, that are stated on the preamble to this quiz, left that line at Trevor. --- old post above --- --- new post below ---
The problem is more one of understanding where the lines named in the preamble actually are (sorry, were) rather than not reading the preamble. There's not exactly a wealth of resources available for some of them.