Great Northern Railway Western Star no 27 at Summit, Montana in 1967.

Great Northern Railway Train 78 with engine 3017 in a snowshed on up grade west of Summit, Montana in 1969.

Great Northern Railway Train 78 second section with F-unit no 460A helper engine at Summit, Montana in 1967.

Great Northern Railway Train 78 with helpers at rear of train near Summit, Montana in 1969.

Great Northern Railway Train 78 with helpers being cut off at Summit, Montana in 1969.

Great Northern Railway Train 78 approaching signal bridge at Summit, Montana in 1969.

Great Northern Railway Train 78 with leading engine 3017 going around the last curve before cresting at Marias Pass, Montana in 1969.

Great Northern Railway Train 78 with 4 GP-9 helpers at signal bridge, Summit, Montana in 1969.

Great Northern Railway Train 492 second section at Summit, Montana in 1968. Helper engines on second section of freight Train Number 492 at summit of Marias Pass in snow scene.

Great Northern Railway 728 at Summit, Montana. The locomotive is a General Motors Electro Motive Division Model GP-9. Other subject classes: Locomotive, GP-9