There is no filter. I have gotten glimpses of the top of these when the loco is operating (no photos, though) and the top is open, nothing over the exhaust stack. The box obviously serves as a closable "lid" when the loco is in storage. I have seen one good photo of one on the internet, but it is a copyrighted image from a professional photographer.
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BurlingtonNorthern11's Locomotive Project Thread Thing
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