Greenbrier Intermodal prototype Twin-Stack double stack container car GBRX 1984 loading Sea-Land 40' containers. GBRX 1984 was built for Greenbrier Intermodal by FMC Marine and Rail Division Portland, Oregon in August 1984. GBRX 1984 was loaded with Sea-Land 40' international containers and made its railroad industry debut at the Railroad Suppliers Institute show in Chicago, Illinois in August 1984. Its car body was built for 125 ton intermediate trucks but was produced with 100 ton intermediate trucks and 70 to end trucks. The GBRX 1984 had the capability to load 40' international containers in all 5 wells and 40' or 45' international containers on top. Tare weight was 217,300 pounds and the load limit per well was 90,000 pounds.