Huh? The -7 is a perfectly good stand-in for a -5 , with no external differences:
Madness
C50-5 International Car Company - 1974 build
C50-7 Paciic Car and Foundry - 1978 build
certainly a 'stand-in' for the real thing, just like the Con-Cor model...
Regardless of who built what and when - if the real -5 and -7 are externally identical, then the Athearn model isn't a "stand-in" and the upcoming SSW release is prototypically accurate.
Balderdashthat side sill alone disqualifies the C50-7 as 'identical' or 'no external differences' from a C50-5. Wishing it were so and making brash statements does not make a C50-7 model painted up as C50-5 correct. While the models are similar, the conversion to a reasonably accurate C50-5 might just make a useful magazine article...