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Spiral Tunnels — Yoho National Park

evidence

Supports the Big Hill's original grade of about 4.4–4.5 per cent over Kicking Horse Pass and its reduction to 2.2 per cent by the Spiral Tunnels, built 1907–1909. V55 verification basis: the Parks Canada page was returned in search but not fetched; the grade figures and the 1 September 1909 opening were carried in accompanying Canadian rail-history summaries and differ between sources on 4.4 versus 4.5 per cent.

A evidence is not a place. Drawing it on a map would assert something about the world that no stored fact supports.

Evidence · 0

This object cites no evidence.

Timeline

No dated observations are stored for this object. Atlas shows what was observed and when — it does not infer a history.

Connections · 0
    Assembled narrative · 0

    This object does not clear the publishing floor: an assembled narrative needs a description and at least one cited piece of evidence.

    Observed changes · 0

    No public Signals are attached to this object. Signals show what changed and when it was observed — never a direction or a rank.

    Actions

    Read the assembled narrativeThis object has no public Experience: one needs a description and at least one cited piece of evidence.Continue in StudioOpen TwinTwin does not start a decision from this kind of object.ShareSaveSaved objects are part of the authenticated projection, which is declared and not yet built.

    /atlas?object=EVIDENCE_EV_PARKS_CANADA_SPIRAL_TUNNELS