If I were doing this – and every time I look at the thing I get tempted – I would start with the dummy EP-2 that one of the Chinese hobby companies posts on eBay (I won’t post the eBay link as it will expire at some point, but look for seller ‘Qiaowei’ and search for EP 2 (1919) - I can post the link if anyone can’t find it) This would appear to have at least a guide for non-GG1 sideframe detail, and I suspect the body would be relatively easy to adapt – if nothing else, as a starting place to use Ed’s drawings for detail.
Overmod, I couldn’t find that seller (now I think about it, I may have put a “u” after the Q when I searched), but I searched for the EP 2 (1919) alone and found it being sold for a reasonable price by seller guoyueh9. I see what you’re thinking. It’s hard to tell for sure, but it looks like it doesn’t have the separate fore and aft sections, unless this is just hidden by the length of the body. Either way, it does look like it would be a good start, as you say.
-Matt
The New Haven EP-2 comes from al older school of ‘high-speed’ electric locomotive design, in which unpowered pony axles were needed to stabilize bogies/trucks (and hence a bidirectional locomotive would need pony trucks on either end of the large ones that, as in this design, supported large twin motors for quill drive. Note that these axles aren’t pivoted; in fact I don’t think they act as Cartazzi axles with a little constrained radial steer to their lateral. This is no different from the design found in a number of early deep-firebox engines with small trailing axles.
https://en.wikipedia.org/wiki/New_Haven_EP-2
This was perpetuated on some electrics with three-axle underframes and no underframe articulation by keeping lateral pony axles inboard and using pin-guided lead trucks outboard, so the engines resembled a pair of Pacifics back-to-back in how they were guided.
The New Haven EP-3 would, of course, if it were available as a model ‘ring all the bells’ in this thread. It has a boxcab with comparatively long porches on the ends, and it has a thoroughly GG1-like undercarriage… in fact the EP-3 was the class that directly inspired the GG1s, so there is more than expedience in ‘retconning’ someone’s GG1 chassis into one of them.
The Milwaukee Road bought (as their class EP-3, which is confusing if you don’t know what you’re reading about) locomotives very similar to the EP-2s. They were liked by the crews and were initially good performers… but the frames were built too lightly, and the amount of lateral suitable for Mr. Morgan’s railway was not at all suitable to parts of the PCE. (This is part of why heavy cast underframes rather than composite fabricated frames came to be used under this kind of electric locomotive…)
The easiest approach if you want a longer engine is to replicate the ‘double-Pacific’ arrangement