How many of you did what my brother and I did: place an old style (Brit) penny on the track to be flattened by the steam engine and carriages. I think I still have a couple somewhere in my archive of junk.
My favorite lines were the LNER branch line from Morpeth, Northumberland to Scots Gap. Tank engines mostly, and they ran past the the farm lived on (1951), that and the GWR line from Builth Wells to Builth Road, it ran alongside the River Wye for part of the way.
Michael