Holland America Westours passenger car 510 on the end of a Burlington Northern (BN) freight train with Burlington Northern caboose 10513 at South Seattle, Washington in 1987. Photo by J.M. Fredrickson. Other Subject Classes: passenger car, caboose

Burlington Northern Piggy Packer working at the intermodal yard in South Seattle, Washington in 1980. Photo by J.M. Fredrickson. Other Subject Classes: piggy back car.

Burlington Northern Piggy Packer working at the intermodal yard in South Seattle, Washington in 1980. Photo by J.M. Fredrickson. Other Subject Classes: car loader.

Burlington Northern Piggy Packer working at the intermodal yard in South Seattle, Washington in 1980. Photo by J.M. Fredrickson. Other Subject Classes: piggy back car.

Burlington Northern trailer is unloaded from a flat car by a Piggy Packer at South Seattle, Washington, on April 26, 1971. This event is commemorating first arrival of train number 3 at South Seattle. Photo by J.M. Fredrickson. Other Subject Classes: freight train, diesel locomotive.

Burlington Northern trailer is unloaded from a flat car by a Piggy Packer at South Seattle, Washington, on April 26, 1971. This event is commemorating first arrival of train number 3 at South Seattle. Photo by J.M. Fredrickson. Other Subject Classes: freight train, diesel locomotive.

Burlington Northern executive passenger train at South Seattle, Washington, on April 26, 1971. The executive cars await the first arrival of train 3, the new fast piggy back service to the northwest. Photo by J.M. Fredrickson. Other Subject Classes: passenger train, diesel locomotive.

Burlington Northern diesel locomotive 6481 at South Seattle, Washington, on April 26, 1971. The power from train 3 connects to a Burlington Northern executive train and prepares to head south from South Seattle after the first arrival of train 3. Train 3 was named the "Pacific Zip" and provided fast piggy back service to the northwest. Photo by J.M. Fredrickson. Other Subject Classes: passenger train, diesel locomotive.

Burlington Northern diesel locomotive 6474 at South Seattle, Washington, on April 26, 1971. Burlington Northern train 3, the Chicago to Seattle TOFC service named the Pacific ZIP, arrives for the first time at the South Seattle intermodal terminal with 6474, 6476 and 6481. Photo by J.M. Fredrickson. Other Subject Classes: freight train, diesel locomotive, people.

Burlington Northern diesel locomotive 6474 at South Seattle, Washington, on April 26, 1971. Officials prepare to commemorate Burlington Northern train 3, the Chicago to Seattle TOFC service called the Pacific ZIP led by 6474, 6476 and 6481, on its first arrival at the South Seattle intermodal terminal. Photo by J.M. Fredrickson. Other Subject Classes: freight train, diesel locomotive, people.