Posted by Erick Anderson on October 9, 2022 
Smokestack lightning.
Posted by Ry Alford on October 9, 2022 
What's the cause of the "light show"?
Posted by James R Doughty on October 10, 2022 
PCA vote! Great fireworks and steam.
Posted by Edward Law on October 10, 2022 
Steam still lives in China! Cool!
Posted by Konrad Weiss on October 10, 2022 
I would guess it is accelerating with a light load causing heavy draft across the fire grate pulling the embers through. I assume that is fairly common occurrence. I know UP often followed the Challenger with a fire train to deal with the fires caused due to embers. This is 1 of the reasons why the Challenger and Big Boy were converted to oil firing.
Posted by Dale Roth on October 10, 2022 
Fireman cleaning out the stack. This is due to using dirty coal. Must like slag.
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