The cars have close coupler hooks and each car has different interior details

Model Number: 57801

7 sections of straight plastic track (172 mm / 6-3/4)

This is a Piko 62224 Bunkhouse Building Kit

Based on classic Star Trek episode: The Space Seed

Lionel 6-12729 O Gauge Operating Mail Pickup Set ProductID_11490195 The cars have close couplerHere is a Lionel 6 12729 O Operating Mail Pickup Set from the early 1990s. When activated by a passing train, the arm swings out and the mailbag is picked up by the train. Be forewarned to make this accessory work you must glue a magnet to the inside of a car. The semaphore arm also swings down as the train passes. The accessory stands about 8 inches tall. Condition: Factory New (C 9) Operational Status: Functional Original Box: Yes (P 9)