Reply to "UPDATE ... March 2024: 3rd Rail SD40-2's"

Boilermaker1OGR Forum Member

@GG1 4877 posted:
Paul, these are going to be 072 minimum recommended curves for 3 rail and 54" radius for 2 rail versions. That is typical for all the 6 axle 3rd rail locomotives of this length due to the drive system.

Ok... I'm gonna ask it. Whats the difference in the drive system between a 2 and 3 rail one, besides the wheels, that makes the 2R one need another 36" to turn around? I'm really asking because I'd probably buy one of these, but owing to the fact that my 2R layout was a re-lay of a 3R one, the min radius of it is 36" (O72). Its what? 17" long?

Its a bit apples to oranges because of the drive setup, but several MTH and Atlas 6 axle diesels will do 36"R without any issue (even ones that say bigger on the box). If this drive can do O72 for 3 rail, what is different with 2? Does the 3R one omit details and hanging bits that get in the way?

2/9/216:30 PM

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