Spamcan81
Member
I strongly doubt that this is right; but -- Lappa Valley Railway?? A short section of, originally, the Cornwall Minerals railway (4 ft. 8 and a half in.) -- after this concern taken over by the Great Western, the relevant stretch was for a while -- at least notionally -- dual-gauge 4 ft. 8-&-a-half, and 7 ft. Lappa Valley (15 in. gauge) laid on a section of this, by then abandoned, Chacewater -- Newquay line.
Not the Lappa Valley but it would seem there's more than one possible answer to my question.