I like this discussion about modeling the SD7. I was curious as to the size
difference the SD7 presented to the GP7. It turns out the SD7 isnt really
that much longer and the overall engine is smaller than the PA-1 and FM
Trainmaster. The too big argument doesnt hold up IMO.
The SD7/9 had 135 wheel base with a 35 bolster pivot point and overall
length of 608 ½.
The GP7/9 had 9 wheel base, 31 bolster pivot point and overall length of
56 2.
Alco PA had 156 wheel base trucks, the bolster pivot points were 34 2
and the engine was and overall 65 8 long
The FM Trainmaster had 13 wheel base trucks with a bolster pivot point of
41 6 and overall length of 66.
All things equal, the overall length I used was the coupler face to coupler
face. My numbers came from Loco 1-The Diesel which have drawings by Larry
Jackman and George Trager.
Seems to me that the SD7 would be a good engine to model. It was first
offered in 1952 and they still ply the rails today. BNSF and NS still
roster them. SPs ran till 1999 or so and many of theirs went to short
lines and museums. Anyway just some thought about the SD7 and its relative
position in size compared to some existing models.
Greg Elems
Reno NV
[Non-text portions of this message have been removed]
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