One more comment: The original Postwar Lionel whistle control systems often would not generate enough DC offset to operate the whistle relays when there was insufficient load on the transformer.
If your trains are all modern era units with can motors, that could be your issue.
The answer for Postwar was to increase the load by either adding more cars to the train, or hooking up additional loads, like light bulbs (not LED's) on the same circuit as the train.
Many folks try to test postwar whistling tenders with nothing else on the transformer. Sometimes they work alone, other times not.
The Lionel test benches that had internal whistles to test transformer whistle controls (instead of meters) had an extra coil to increase the load on the whistle control under test.
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