Q. Wrote:
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> Can someone remind me why they had those very
> large headlight cans?
Actually, they're signal lights not headlights, and are intended to increase an oncoming trains' visibility, particularly at night.
If you're interested in learning more about signal lights and other types of locomotive warning lights, here's an excellent website:
[
www.trainweb.org]
The signal lights on the unit pictured are either Pyle-National Model 20350 or 20750 (can't tell which from this angle).