Lots of pulling power noise & smoke.
I recall a Trains Magazine photo from years ago, mentioning "the mighty Century, flame at the stack." I think the Alco noise and smoke we enjoy happened when the throttle was opened and the injectors poured in fuel while the turbocharger hadn't yet spooled up. Combustion was poor and all that soot roared out the stack, and unburned fuel sometimes ignited the soot and collected carbon at the stack.
Just a grand show for us all and that Alco 4-Cycle sound was unmistakable.
I have some old LP records with railroad sounds, some by Mobile Fidelity, which did a superb job with the audio. I might have to get them out and enjoy the "music".
