So, is WSR-1 the correct (and only) relay part number suitable for this task? I noticed there are many different whistle assemblies used in tenders (WS-85, WS-125, WS-175, WS-200, etc.), but I'm assuming that only accounts for the material (metal/Bakelite), orientation (horizontal/vertical), and possibly size of the whistle chamber. The motors and relays all look the same.
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