Yes, shadow factories were built farther out from the town, they also did night shifts.
So shift workers had farther to travel, so let's say forty minutes night and morning, five nights a week, every week, adds up to a lot of hours, lot more expense, so they picked up mates to share the cost. But the big complaint I heard was from wives, so many evenings sitting alone, there should have been a cruelty clause in the marriage.