And thank you for the site! I've found a lot of older pictures there that aren't available on the other sites, especially the Pullman-Standard builder's photos.
As for the lack of thumbnails, I usually look at everything anyway, because many of them aren't big enough to see subtle variations. Paint schemes and car types, certainly, but not the little details. With your listing the date of the photo, I can select by that, and know that, even if it isn't exactly what I'm looking for, it's at least within my era. In most cases I'm checking a number series, rather than a specific paint scheme, so dates are more useful than thumbnails anyway. Not to mention loading a lot quicker.