I've been able to sneak into parks to take photos without paying (Knotts and smaller places)so you never know.
Basically my guidebook gives one page to each railroad attraction operating narrow gauge trains where there is a one-paragraph description, a photo (I usually ask each place/submitter for a few to choose the best of them), the motive power list, then operating days/hours/contact information. It gives the parks a good place to show off their railroads to narrow gauge and railroad folks, as for a lot of park guests just take the trains for granted. (but there's plenty that in fact appreciate them for what they are!)
Apparently Silverwood doesn't advertise their railway that much, just look at the site. They aren't exactly in the middle of a city, or even suburbia, but a lot of people will overlook their impressive looking railroad. In a book I have, there is a shot of the E-N #7 when first delivered to the park (or close to it) in the snow. It didn't have the cap stack at this point either. Beautiful shot.
Also (now that the mental block has subsided)...I forgot to ask if anybody had photos of the Astroworld Harpur in Houston and the Sumpter Valley Railway (I'll probably get more of a response on this one) in Eastern Oregon. Looks beautiful, I saw the wood-burning Heisler #3 at Railfair...some engine. Years ago I remember when they were just running the Heisler and some open cars. How about that Mikado there? That's something else...beautiful engine (did Doyle McCormack work on that? I know it was kept in the Brookyln Roundhouse in Portland). On RYPN somebody mentioned a project for a replica Uintah Mallet up there...eventual plans. That would be an accomplishment. As for Astroworld, the #2 from there was last I heard up at Durango...I thought of it because of course Silverwood did own it at one time (perhaps ran it). Rumor is that it is operational again, and it was discarded for having a bad boiler.
Thanks,
Ed Kelley