Reply to "1044 whistle recfier disc heats up"

@otww posted:

U post is to common rail and "A" post to center rail...

Per postwar convention(all single train transformers), on the 1044 "A" post goes to common rail and "U" post to center rail. The whistle circuit(and direction) are on the "U" post circuit. If you reverse it, you are mistakenly sending DC to all accessories you have connected to the "U" as common in error.

Multi-train/throttle transformers use "U" as the common, to the outside rails.