Try it with 2 batteries to give you 3 volts dc. The relay should close. Then try it with 16 volts ac. The relay should not close. More of a problem with whistle relays is getting power through the contacts that control the whistle motor or horn. If you take that screw out that holds all the terminals on, you can drop out the fixed contact. This gives access to both the fixed and movable contacts for cleaning. On a prewar or postwar relays the contacts are coined silver. Polish then with something not too abrasive. The other problem is the hinge joint at the back of the moving contact. I have soldered super flex wire across the hinge to take care of that problem. This is also a good time to put a single layer of scotch tape on the end of the pole piece. This usually puts an end to relays failing to open. Take a picture of the contact stack before you take it apart, so you can get it back together in the right order.
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