All proto 3 locos have DCC/DCS capability. The switch was included in most, if not all premier engines, and was added to later some railking locos. Later boards have EMI protection, mostly to meet European standards, but function the same. The boards always had capabilities to do a lot of things; the added features were mostly hardware (smoking whistle, chase lights, quillable whistle) and DSP code to operate them.
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