BEFORE - At Cisco, British Columbia, CP and CN are connected by track that drops down 2 percent to the CP mainline below.
 
Here's a CN train climbing the Cisco connector back in 2006.
 
This rarely used track came into prominence last summer when a CP coal train derailed on the CN Thompson River Bridge at Lytton destroying the deck and closing the CN line for 8 days.
 
Rerouted trains used this connector as a bypass but the track had been neglected so long that a CN grain train derailed on this curve tumbling down onto the CP mainline below, blocking all use of the Fraser Canyon route.

AFTER - Here's a recent look at the Cisco connector after extensive work was put into rebuilding it.
 
It appears to have been used lately, possibly due to all the mud slides in the canyons.
 
Ken Storey.