Here is a Lionel 6-18115 O Santa Fe F-3 B Unit Non-Powered Diesel Locomotive. It matches the 11711 Santa Fe F-3 ABA set from 1991. It has screen vents in the roof, die cast trucks, and knuckle couplers on both ends.
This item has been graded per TCA standards C-8: Like New. Overall condition is Like New.