Plat Map of Northern Pacific facilities at Spire Rock, Montana, July 3, 1914, Sheet Number 2, Line Segment 326, showing the Logan-Butte line.

Plat Map of Northern Pacific facilities at Spire Rock, Montana, July 3, 1914, Sheet Number 1, Line Segment 326, showing the Logan-Butte line.

On board Northern Pacific passenger train number 25, the westbound Vista-Dome North Coast Limited, climbing Montana Rockies toward Homestake Pass on June 8, 1955, with a view from the dome looking toward rear of train just west of Spire Rock siding, east of Bridge 51, Milepost 50.8. Photo by J.M. Fredrickson. Other Subject Classes: passenger train, mountains

On board Northern Pacific passenger train number 25, the westbound Vista-Dome North Coast Limited, climbing Montana Rockies toward Homestake Pass, on June 8, 1955, with a view from the dome looking toward rear of train just west of Spire Rock siding, east of Bridge 51, Milepost 50.8. Photo by J.M. Fredrickson. Other Subject Classes: passenger train, mountains

On board Northern Pacific passenger train number 25, the westbound Vista-Dome North Coast Limited, climbing Montana Rockies toward Homestake Pass on June 8, 1955, with a view from the dome looking toward rear of train on Spire Rock viaduct, Bridge 51, Milepost 50.8. Spire Rock in distance. Photo by J.M. Fredrickson. Other Subject Classes: passenger train, bridge, mountains

On board Northern Pacific passenger train number 25, the westbound Vista-Dome North Coast Limited, climbing Montana Rockies toward Homestake Pass on June 8, 1955, with a view from the dome looking toward rear of train between Bridge 51 and Bridge 52. Photo by J.M. Fredrickson. Other Subject Classes: passenger train, mountains

On board Northern Pacific passenger train number 25, the westbound Vista-Dome North Coast Limited, climbing Homestake Pass west of Pipestone siding, east of Spire Rock siding, Montana, looking toward rear of train from lead vista-dome coach, on June 8, 1955. Curve was nick- named Big Curve and number 58, is at Milepost 48. Photo by J.M. Fredrickson. Other Subject Classes: passenger train, mountains