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gp38-2l
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The hardest working units aren't running the country's mainlines, they're in the yards switching 24/7.
You're looking at a typical CN hump set:
GP38-2 mother lead (CN 7500 even)
HBU-4 hump booster unit aka slug (CN 500)
HBU-4 hump booster unit aka slug (CN 500)
GP38-2 mother trail (CN...