The F-unit (FT-F3-F7-F9 and the FP's) dominated my
youth (1960's) and for me it lasted another 20+ years
with the BN Sumas Branch running the last F-units
in summer of 1981. Hated to see them go but I was
ready for the modern era of locomotives as well.
I will aways remember their sound "in numbers"
(meaning 4 or 7 of them) assulting a grade wide-open throttle.
Know YouTube has some great videos of F-unit lashups
and the noise they make.
If you are in a horror movie, you make bad decisions, its what you do.