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To every rule there is an exception. Potash is an important component of agricultural fertilizer. Much of it is shipped out of Saskatchewan Canada by unit train either by CN or CP. Many of the cars in this service are second hand that have been repainted a shade similar to oxide red. Until this summer I was under the assumption that all these cars had round loading hatches. After watching a couple of unit trains pass by with an over head vantage point, I discovered that I was wrong. The vast majority of the cars did have the round hatch but some (maybe 10%) of these second hand cars had the trough hatch. Go figure.
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