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I have an original Tsunami in a P2K 0-8-0 and cannot slow it down at the top end.  It seems to have a set speed at the top end (which is faster than I want but not out of control....about 65 smph which is faster than I want). The decoder will respond to preset speed table settings and I can influence the lower speeds when doing my own table on D Pro, but no matter what value I give the top end, I cannot change the top speed.  Of course the Tsunami does not have a CV 5 or 6 for me to adjust. Am I missing a controlling CV somewhere here? I am using a Zephyr controller. Thnaks.
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