A number of the K-Line steamers got the chuff from the K-Line Cruise board, aka MDK-090. As those were very prone to burning up, you'd have to find an alternative for the chuff. There are a number of versions of the MDK-090 Cruise board and the software on all of them didn't include chuff outputs. I know the Tank Engine gets it's chuff directly from the cruise board, and if there's no chuff switch on your Shay, I would guess it's very likely that it also generated the chuff signal.
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