HandyAndy`s interlocking tower reminded me of such projects that were popular in toy train magazines in the years following the war.
Lionel`s` Model Builder` had many plans for accessories,and even trains. Sometimes made of cardboard, some tinplate. Another magazine with such plans was `Toy trains`. Some years ago I made a tower from an article published in the February 1952 issue.
Here is a photograph of it. More recently I made a tinplate streetcar with a Marx motor, this was in `Model Builder`.
Colin