Many years ago on the Union Pacific, before Steve Lee came on the scene, the 8444 (as it was numbered then) was ALWAYS smoking up a storm. I seem to recall a statement from someone in charge back then that they liked to make smoke, or something like that. Whenever I saw a picture of the 8444 in that era with a towering column of smoke above it, I cringed.
Jack, you know more about the history of the UP program than I do...does this ring a bell?