The industrial landscape is ever changing. As time passes in the world of industry, works and sites spread and grow. The sheer mass and size of some of the structures of the works is staggering. 
Picture Stockton Archive
A Pictorial History of Stockton-on-Tees
I beg to differ with Robert Harbron but the pipe-bridge stretching from the West to the East Gate was located on Nitrates-Avenue. The black line towards the top of the photo is Ammonia-Avenue. On the other photo the 3-storey building at middle-right is the Process Offices. I worked in the Products Works Drawing Office as a draughtsman from 1961 until 1965 in this building. The Chief Draughtsman was Walter Slater.
Taken in the late 1950s, in the centre is the vast rail “South-Grid”, with access for over 400 wagons. The buildings in the photograph are only a small section of this vast complex including both “Oil-Works” and “The Stalls”. The black line from left to right is Ammonia-Avenue pipe-bridge, a canopy of hundreds of pipes, from the West to the East Gate. The two cooling towers went by the name “Tom & Jerry”. Far right is Haverton Hill Road. Bottom right centre is the junction of New Road and Haverton Hill Road, near “British Titan”. In the bottom right corner is a storage tank in its “bund-wall” of I.C.I Liquid-Filling New Road.