One of the facebook groups I’m a member of is the Industrial Railway & Locomotive Appreciation Society and there has been a very nice link posted to a website with oodles of photos of both mainline rolling stock and industrial internal user wagons. The site is by Paul Bartlett and features numerous galleries for specific types of stock and within the industrial section galleries of specific locations with photographs of different types of wagons within each gallery. Thanks to Paul this website could be a very helpful resource for detailing and weathering, and also for a bit of atmosphere.
The site can be found here http://paulbartlett.zenfolio.com/
Staffordshire Finescale 
Indeed, it’s a fantastic resource for wagon modelling and inspiration – many of my wagons have been based on photos in Paul’s collection. Initially I wasn’t sure about Zenfolio – preferring his previous and much lamented fotopic site, but now I’ve got used to it I think it’s easier to search and find stuff on the new site.