In the 1940s and 1950s, Skyline of Philadelphia manufactured and marketed a line of toy train-oriented building kits. Actually, there were two lines: One was a line of building kits made of cardstock and wood, and one was a smaller line of lithographed tin buildings, similar to the inexpensive toys made by the likes of Louis Marx, Wyandotte, and countless others in the days before ubiquitous plastics.
I’ve long suspected the two product lines came from the same company, but had no evidence to prove it until Ed “Ice” Berg produced scans of a Skyline catalog containing both paper/wood and tin litho buildings, side by side.