This is Lionel 6-27086 Grand Trunk Western 60' Boxcar #383575. In the 1960’s, 50’ and 60’ boxcars became common sight on the rail lines replacing many aging boxcar fleets of the past.
Its key features are:
Die-cast metal sprung trucks and operating couplers
Hidden uncoupling tabs
Rotating bearing caps on trucks
Separately applied metal underframe details
Opening doors
Road number: 383575
Dimensions: length: 16
RailLine: Grand Trunk
Minimum curve: O-36
Manufacturer: Lionel
Model Number: 6-27086
Scale/Era: O Modern
Model Type: Freight Cars