Assuming we are talking about industry generally as opposed to specifically factory, another obvious one is Lee Dorsey's Working in a Coalmine.
But the ultimate factory song must surely be The Four Vagabonds' Rosie the Riveter.
"All the day long,
Whether rain or shine,
She's a part of the assembly line.
She's making history,
Working for victory,
Rosie the Riveter.
Keeps a sharp lookout for sabotage,
Sitting up there on the fuselage.
That little girl will do more than a male will do."
I seem to recall a film about her in the late 70s/early 80s?
