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I always thought they cut the hole in the roof to make it easier to drop the reefer unit in, or replace it if it failed.Carter
You would be correct. If I remember correctly, they did not get GPS until several years after the Carrier units were installed.
Found this gem (in the n-scale category, no less) and thought y'all could have some fun with it, photoshop-wise.
The announcement states it uses minimal track power and the volume is adjustable with a potentiometer. Full specs in the PDF announcement.