WARNING: This thread drifts about all over the place ........ readers who wish to 'cut to the chase' should skip on to Page 8 or 9.   In about 1971, I bought a Triang-Hornby 'Nellie' type 0-4-0T with the idea of building a layout based very directly on Rev. Heath's famous 'Piano Line' (see the thread 'Time to Tune the Piano' for the story of that layout). The layout never got built, and for the intervening nearly half-century Nellie has barely turned a wheel, while the box she lives in