The MacMillan yard is just north of Toronto where the 400 highway crosses highway 7. The best viewing point is from the highway 7 overpass which crosses the CN yard on the south. Unfortunately it is hard to see hump action from that point. The map shows the spread of this major yard.
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Robin
NARA member #2
http://members.nbci.com/Matthyro MAT

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Robin
NARA member #2
http://members.nbci.com/Matthyro MAT