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Reply to "Big Boy #4014 moves under power for the first time in over 50 years • The UP is bringing out the 4014, see schedule 🚂"

The diesels aren't necessarily for assistance. Out here, they're very handy for dynamic braking going through the Cajon pass. Also, when 3751 makes a run, the diesels are handy for HEP for the passenger cars. UP handles that aspect with a generator car.

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