Edit: this is actually a former NYC RS3, not New Haven. But the cab signal equipment looks similar, so this ended up being relevant anyway.
My next locomotive project is a Penn Central ex-NH (edit: NYC) RS3, but I can’t find any photos to explain what this device in front of the cab is. I picked this loco because its details are an easy match, but with only this one watermarked reference photo, I can’t figure this thing out. Any ideas?
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Enlarged and enhanced:
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-Steven