Gloobey, thanks for the info about those old roofs - I had never noticed those before! I wish Playmobil still used those for something as they are very appealing!
Thanks, Pingo, for your excellent research! There is the doghouse roof in green and it is probably the same piece as was used on the school house. You also proved what I was wondering, that the treehouse roof came much later than the vintage of the train layout photo.
Gepetto, that was a good idea about the treehouse roof, though it does appear to have come along much later in time. Even so, the tree house roof has some distinct "3-dimensionality" to it where the brown roof in the photo is really flat - if you look really closely at the photo and compare the brown roof to the little green roof piece, I think you can see what I mean - the two pieces catch the light differently. I hate to be stubborn, but I still say the brown roof is cardboard!
