Thanks to Michael Thompson for the following contribution.

In 1894 Bolckow Vaughan & Co discovered a thick seam of salt, which led to the forming of the Greatham Salt and Brine Company. In 1903 this was bought out by Cerebos, part of the Rank-Hovis McDougall (RHM) group. The site ceased producing salt in 1971.
Sharwood’s also part of RHM had taken over part of the site in 1966 for the production of curry and chutneys. RHM took over full control in 1968 producing such brands a Bisto; Atora and others. The site fully closed in 2002.(Info-This is Hartlepool: Cerebos Salt Works)

Railtracks at Cerebos Salt Works, looking east towards Hartlepool.

Map showing the location of the tracks.