Those paying really REALLY close attention may have noticed that in the last few pix Tinplate Mountain looks a bit different than in the overall view posted early in this thread. That's because Tinplate Mountain was not always the majestic, ski-able peak it now is. It was originally an AF tunnel that I got for Christmas in...uh, 1961, I think it was. Actually, the entire layout looked much different in 1987, its first year as a permanent layout.
Though all of the track that would ever be used was there at the start, many of the first few plaster buildings still needed paint. Many accessories and other features would be added a little at a time each winter.