Rail Road engineering is some of the finest engineering.   The trains have to keep on schedule, and the tracks have to be always passable.  

In the image above, avalanche/dry landslide sheds deflect rock over the tracks on the Canadian National east of Vancouver, Canada.  The telephone poles near the sheds have wires which trip an alarm if a rock hits the wire.  

Here is geology in constant flux, and our RR engineer's telepathy efforts.

The Canadian Pacific track is on the south shore of the river.   I may have the CN and CP reversed & and the Frazer and the Thompson - I am working on this.  Any help out there?

Pretty neat - the horses along the valley have the same colorizations as the geology!