In my never-ending quest to find obscure topics to add to this forum, I realized I have another small sub-collection among my postcards: funicular railways. I've taken rides on many of these, wherever I travel -- most recently the Duquene Incline in Pittsburgh. They exist (or existed) in most older cities with a lot of hills. There was a famous one built up the side of Mt. Vesuvius, which inspired the song "Funiculì, Funiculà".
I also have postcards of the Pike's Peak Rwy, but that is actually a cog railway, with a single locomotive. A true funicular has two cable cars, which act as counterweights -- one goes up as the other comes down. Sometimes there is a single track with a split in the middle, where the cars pass. Most often funiculars were built to take tourists up to panoramic vistas, but in the days before trucks, they had functional uses, like transporting carriages and market goods up steep hills.
Here are the examples I have so far. I'm sure I'll find more to post down the road.




You'll notice on this one, the postcard printer took some liberties with the steepness of the grade by tipping the photo an extra 20 degrees. But the trees give it away.







