I see what you mean, it never gets to the 4th chuff. Not a common issue. What is even more puzzling is you said it worked fine to start with. It sounds like it is stuck in 3 chuffs per rev. You may want to reload the chain file again, it have been corrupted. I had a problem a few days ago with a NYC streamlined Hudson that I upgraded to PS-3 and the driver lights would not come on. Reloaded the chain file again and they finally worked.
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