I never heard of that before, and the other early Legacy locomotives with a chuff switch certainly get all their chuffs from the chuff switch. Not to contradict Mike, but I believe he may be mistaken on this point. The 6-11224 E6 with whistle steam is one I had to fix the chuff switch on, and I can assure you all the chuffs originated from that switch. It's also one of the most crowded shells I've had to work on, the addition of whistle steam, etc. make that a nightmare to work on and to dress the wires again to get it closed up.
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