Two years ago, I struck up a conversation with a guy that was loaded down with video cameras. He was standing next to the Moffat tunnel, which was built about about 100 years ago to allow trains to get under the continental divide after leaving west out of Denver. At the time, it was a massive and expensive undertaking, but it has paid for itself many times over since.
Anyway, it turns out that he had taveled all the way from Italy (if memory serves) just to take video of trains.
Well, this is for all those train buffs out there.