Philadelphia Gas Works forms a wedge between North Yard and the refinery section of the complex. The web of pipelines visible on the Petrochemical Infrastructure Map connect the North rail yard with the refinery, much of the PGW property is vacant. The large cage-like structure is an old gas storage container called a gasometer, constructed by PGW in 1856. A gasometer is used to store natural gas at atmospheric temperature and ambient, relative to the surrounding environment, temperatures. If the structure were still in use there would be walls visible inside the cage with a visible “cap”, rising and falling dependent on amount of gas stored.
