Like Rob said, that 1041 is an interesting transformer. I believe it was the first transformer with a built in whistle controller. The 167 whistle controller has a choke to compensate for the whistle motor current increase. It should not allow too much voltage drop. There is a special 167, the 167S for the 726 since it is a heavy current user. You might want to find a 167 that you know is working properly and test it with a train to see how it works. The 167 is classic 1946.
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