Redgrave is a 2,366-metre (7,764 ft) Canadian Pacific Railway (CP) siding at Mile 57.3, Mountain Subdivision.

[5] However, mystery surrounded a simple grave marker at the west end of the rail yard bearing the inscription "J McIvor, 1886".

[8] Just west of Redgrave was the short tunnel, followed by a sharp bend in the track, forced by a turn in the river.

Train engineers exercised caution owing to the extreme curvature, and a predominance of landslides in the area.

[5] Over the first 230 kilometres (140 mi), the Columbia River fell less than 12 metres (40 ft), until flowing through a gorge called Redgrave Canyon.