nsconductor
Member
Here's ya a very tight curve on a prototype
12'' curve, wow, that's must be why they use a trackmobile, I'm not sure any other locomotive would like such a curve
one of these days, someone is going to find a prototypical helix.
Did some crude measurements on an aerial shown on another site. The radius of that curve is around 85' making it a 70 degree curve. Works out to be around a 12" curve in HO scale. The Uintah RR had 65 degree curves on 7 1/2% grade. The Los Angeles Junction Ry has an 85 degree curve & a #3 switch. So if you have things tight on your layout, there's a prototype for it. Here's a table from Freemo:
http://www.trainweb.org/freemoslo/Modules/Tips-and-Techniques/degrees_of_curve_to_radius.htm
Where is this located?
Dave
you probably confused with some other picture. author of the pic describges:
"The loop track is approximately a 45 degree curve -- an 18-inch radius in HO scale."[/Q
Nope it's the same place. One of us is wrong w/ our measurements. But did that alot on engineering drawings & aerials at my old job.