Does this count? Growing up, my favorite electric slot car was a black CSL, followed by a white/green 917. I completely forgot about my old slot cars over the years.
One beautiful sunny Sunday morning, I saw an immaculate Fjord CSi being lazily piloted down Valencia in SF. I chased that car on my bicycle until they parked. I was mesmerized, staring at her for what seemed an eternity, yet something seemed eerily familiar. I decided then and there that I'd eventually purchase one for myself.
One year later, I had purchased my very own 1972 Italian import Fjord CSi. Two years later, I added a basket case Baikal parts car to help out the '72 - that was almost five years ago now.
This past Christmas, I was visiting my parents and decided to scour their basement for my old slot car track. Lo and behold, they had saved everything! I pulled out the track, then the old box of cars, and there she was - my old black CSL! I had completely forgotten about her. It was now abundantly clear why that CSi in SF had struck such a chord 30+ years later - it was like being reunited with a beautiful past flame.
As you can see, instead of a train, I set the slot car track up around the tree so we could all have a bit of nostalgic fun!
edit: My dad had a Euro M635i growing up, so that might have influenced me just a bit!