The Tanfield waggonway dates from 1725 and earlier. Tanfield Railway in its current form has a history going back to about 1971. You may be interested in the photographs of early days on the Flickr site which is maintained by Tommy and Robert Knox.
Neil with a kettle - Pickering's Sentinel is being used as Causey station pilot in the early 1990s, like AW No.2 currently - at that time the line from Causey to East Tanfield was under construction.
Flickr is one of the key links provided under the heading picture on this blog.