Your '57 probably has an "off" position where you could take the key with you and the farm hands could start the truck without the key. It's the first position after you take it out of "lock".

"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
1954 GMC Suburban Now with a new proud owner.