Template:Footer Cargo/doc
From Captain of Industry Wiki
This template is supposed to be invoked on the bottom of every article and every template.
It checks if the page is directly or inderectly relevant to Cargo data definition and displays appropriate messagebox.
The usage is requested at the very bottom of pages, because of the mechanic used to detect data definition.
It abuses the fact, that every defining template sets a variable cargo_define_invoked. In general, we can't know where exactly on a page data was defined. To be reliable, the check must occur at the end, after all transclusions are resolved.