I found a low-res P42 diagram online that shows a distance between the truck centers of 43' 2 1/2". When I compared that to a series of P42DC direct side-view photos I'd taken (and assuming "center" is the midpoint between the axles), that dimension matched. Perhaps I'm wrong, but I can't see how the truck center could be anything other than the midpoint between the axles on a symmetrical 2-axle truck - and using a distance of 43' 8" between the truck centers doesn't seem to match the rest of the P42 proportions. I don't know if this applies to the P40-P42, but GE has a history of occasionally changing dimensions (such as using three different combinations of frame length and truck centers on 4-axle Dash-7's) and their own drawings don't always match what later gets built.
http://www.the-blueprints.com/blueprint ... 0-42bw.gif
I've used CN and NS diagrams as reference for making some of my drawings. The dimensions are the same between the CN and NS ES44DC/ES40DC diagrams (and all dimensions also apply to the ES44AC). The CN ES44DC diagram is here (incorrectly listed as a Dash-9):
http://www.cnrphotos.com/gallery2/main. ... ewsIndex=1
For the ES44DC, I used the RR diagrams in combination with detail photos to make my own versions here - the drawings are 4 pixels per scale inch, so any dimension can be gathered from the image:
http://trainiax.net/mescaleloco-results ... &scale18=1
Regarding the discrepancy in truck centers (46' 3" vs. 53') - the "truck center" probably doesn't line up with the center axle, but I can definitely say that the distance between the center axles on the Dash-9 and ES series is 46' 3". A distance of 53' combined with a truck wheelbase of 13' 2" would push the ends of the trucks beyond the end plates.
Regarding the ES-series height, a deck height of 5' 10 3/4" (per the CN and NS diagrams, plus photo measurements) makes the height over the cab roof 15' 5 1/8" - the height of the cab over the walkway is 9' 6 3/8". The edges of the exhaust stack are about 3" higher than the cab roof, and the horn is about 2 1/2" higher still - but the highest point from what I've measured is the antenna dome on the cab roof, which works out to around 16' 0".