Correct. I have done it, and also have upgraded all of my whistle/horn-only can-motored steam & diesel locos to PS2 and 3 steamers to PS3. You did not say whether steam or diesel. I have not upgraded a diesel to PS3 Steam PS3 upgrade kits are very similar to PS2, but the diesel kits, I am told, are more difficult due to a profusion of very fine wires.
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