>still can be confused with mercury vapor street lights.

Mercury vapor lights. From a distance they can also look like green signals. Green light travels
best in the earth's atmosphere, which is the reason for the flash of green at sunset and sunrise.

>college trained MBAs are always the slowest to learn;

This is what comes from teaching for the mutiple-guess tests.

>it would have to be moved further away from the track, and apparently that costs more money than firing somebody.

Install a side bracket and mount the signal head on it?? Naaa, to simple (and requires no ad nauseam engineering studies with their requisite plethora of CAD drawings).

>the big-shots always know more than any signal engineer - just ask 'em!

You can lead a big shot to management, but you can't make him think.