I was driving south on the Perimeter last night, after a Prairie Dog Central meeting, and I saw an eastbound train on the CN mainline as I approached Wilkes Avenue. I saw that it had four engines on it, two conventional CN engines followed by a blue ex-BC Rail engine. The fourth engine, though, was something unusual, in an orange-brown livery. Time to chase!
I took the exit and headed east on Wilkes Avenue. Before too long, I was ahead of the train and I could stop to grab a quick video in the rain and approaching darkness.
The mystery engine is CN 1700, a GE B39-8E that BC Rail acquired in 2000. It has special orange-brown livery for use on the Whistler Northwind, a service that ended in 2002 after only two years of operation.
CN 1700 still wears the same colours, albeit somewhat faded, and it has the Whistler Northwind logo on the side.
The following is a very nice video by boots176 of the same unit, back in 2002 when it was still pulling the Whistler Northwind.