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A year ago, we stayed in a hostel in Nelson,BC, Canada. The town is on The Canadian Pacific line. Freight trains stay for a while in the yard, and then blow their "long, lonesome whistles" before setting off to the north east. Canadian trains can be quite long. Maybe 120 freight cars, two and a half kilometres long with three locomotives. We dashed to the road crossing to see a freight train leave, ringing it's bell over the road crossings as it went. It was just 40 wagons long. Only a couple of yards from the side of the freight, you could smell the contents as they passed. Chemicals sometimes, but mainly the wonderful smell of freshly milled timber.
Sorry about the locomotive image. It falls over on it's side when I post it!