Ah, my bad - I could never keep the F45 / FP45 / SDP40F straight. Those look pretty sharp though. Some people really get their trousers in a knot over 'foobies' but like you said, I happen to find the 'Alternate Realities' quite entertaining. There's some really awesome ideas out there.
Well the easiest way to remember is that Amtrak never owned any F45s or FP45s. For their similar-nosed engines they had: SD40F, F40PH (& NPCU), F69PHAC, E60, B32-8WH. Although they are all fairly easy to tell apart. Here is a very basic run down:
F40PH - most common of that style
SDP40F - Longer then the F40,
F69PHAC - Similar to the F40, except the window comes the edge of the nose, loosing the little 'platform'
E60 -Very Short nose, longer then the F40, & Electric
B32-8WH - Looks like a regular freight engine
peter