The Lionel whistle relay is a slug relay. A very special relay that operates on DC, but not AC. I doubt you will find an equivalent relay. Usually the problem with horns is there are just too many contact points in the battery circuit, which is only 1.5 volts. As Adriatic said above, clean the contacts on the relay. Another problem is the relay armature hinge point. Many people add a super flex wire shunt around this hinge. Find as many of the other contact points as you can and dissemble them, clean them, and reassemble using a little silver grease. For those contact points you can not get apart, try spraying a little Deoxit D5 on the joint.
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