This is probably a stupid question, but it is bugging me. If I have 45 inch radius 2 rail curved track, does the radius refer to the center line of the track, the inner edge, or the outer edge? Logically it should be the center line, but I don't have a piece of curved track to measure this.
Pete
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center line Pete
Thanks. Like I said it is a stupid question, but I couldn't find anything that actually said that flat out. Much appreciated.
you welcome but the only stupid is one you dont ask
Unless your post is really stupid. As perceived by others (not me). I was informed several years ago that one of my posts showed that I was totally wrong about an issue. That really made my day.
I generally use it to refer to center line. However, if you are consistent on your own layout and make your own templates, you construction will be just fine.
Doug-Sr posted:you welcome but the only stupid is one you don't ask
Amen to that!
I always use the inside rail. But it isn't important to me - what is important is whether my locomotives like the curve.
A fellow forumite once jumped me so hard for my "facts" that I started putting "opinion" at the end of each post. All I had done was state that my latest Mallet had two different gear ratios, and that it worked great, and the guy went more or less ballistic. Hatred was dripping from his post. I never figured out what I had done.
Peter Lagus 091618 posted:This is probably a stupid question, but it is bugging me. If I have 45 inch radius 2 rail curved track, does the radius refer to the center line of the track, the inner edge, or the outer edge? Logically it should be the center line, but I don't have a piece of curved track to measure this.
Pete
Pete,
Have no idea what you will be running (or trying to run) on that radius, but it is a small number for O scale. My only advice is make your curves as WIDE as possible!
Good Luck,
Simon
45" is the 3rd Atlas radius up from smallest (36", 40.5", ...). All of their O-scale will run round that. My US Hobbies UP 2-8-0 would cope with ~28" radius hand-laid track up the dark end of my first O-scale layout. 80ft passenger cars looked a bit strange though.
Jason
Doug-Sr posted:center line Pete
Does that also apply to 3rail 031 track ?
Doug W. posted:Doug-Sr posted:center line Pete
Does that also apply to 3rail 031 track ?
O31 is measured from the outside rail and it measures diameter, not radius.
O31 would be 15-1/2" radius measured from the outside rail, 14-3/4" radius if measured from the center rail.
Rusty
Jason Dickie posted:45" is the 3rd Atlas radius up from smallest (36", 40.5", ...). All of their O-scale will run round that. My US Hobbies UP 2-8-0 would cope with ~28" radius hand-laid track up the dark end of my first O-scale layout. 80ft passenger cars looked a bit strange though.
Jason
Actually Atlas does or did a 24" radius track in two rail as that's what I have.
bob2 posted:I always use the inside rail. But it isn't important to me - what is important is whether my locomotives like the curve.
A fellow forumite once jumped me so hard for my "facts" that I started putting "opinion" at the end of each post. All I had done was state that my latest Mallet had two different gear ratios, and that it worked great, and the guy went more or less ballistic. Hatred was dripping from his post. I never figured out what I had done.
...seems sometimes it doesn't take much... 
Mark in Oregon
Rusty Traque posted:O31 is measured from the outside rail and it measures diameter, not radius.
O31 would be 15-1/2" radius measured from the outside rail, 14-3/4" radius if measured from the center rail.
I use 14.14" for track planning in O-31, 12.37" for O-27, 35.88" for O-72.
Whenever I've used 'sectional' 2rail track when I place the track on the layout the center line of the piece always seems to match the lines drawn on the table. Just sayin! 
Russ
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