Could be the setup of an railroad version of a classic joke: Two switchers, tank car, and a passenger car roll into a yard...
The SD45's were the railroad equivalent of the 1960s muscle cars. Big engines, lots of power, and not to forget, lots of noise! Nothing like the sound of 20 cylinders (total 12,900 cu.in.) roaring at full throttle!
Well put and I so miss the intensity of sound and feel as hard-working units pass by in this modern era. Everything sounds rather muted today. April 1990, Montgomery AL