The information that exists on the questions you raise is recorded in the
Bulletin on CB&Q E Units.
I don't know that anything further has been unearthed since it was published.
I don't think any pattern has been uncovered, but it is likely that the
Stainless Units were intended to work the premier trains... those equipped with
stainless steel equipment... and the painted units were to work the secondary
trains. (recall that the CB&Q ran many trains with heavyweight and modernized
heavyweight equipment through the 50's and 60's). When the units were thrown
into a common pool such distinctions went out the window and the cost of
completing the conversion of the entire fleet (especially the E7s) apparently
wasn't deemed prudent.
One minor correction.... the E5s did not have "stainless steel sheathing
covering their bodies"...... they were stainless steel versions of E3 (phase I)
and E6 (phase II) units. The noses, roofs, ends, and the structural framing
were all stainless steel. If they hadn't been the units would have rotted
like the Pullman Standard
corrugated cars did due to corrosion caused by the electrolysis between steel
and stainless steel. They were, indeed, one of the most magnificent diesels
ever.
And no, the Passenger F3s never got any stainless steel panels. They also did
not get the Red Nose Trim and Louvers.... having been repainted into freight
colors
just before that change took place or during the transition.
Charlie Vlk
[Non-text portions of this message have been removed]
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