Not so much automation as mechanization. Almost all of that was controlled by an operator...or more than one.
Still had a lot of that when I worked for cat in 1970-1971. Still had a foundry or two with tamped earth floors, and no such thing as A/C. Winter heating was marginal, at best. Like to froze my tookus off a time or two.
It wasn't much more advanced at McDonnell Douglas in 1978-1979. Mechanization up the wazoo, but very little automation. Still no A/C and little heating...but California winters are warmer than Illinois.