long trains on curves

in scarmif you highlight all the tracksin the loop then right click it give you an option for length of selected in this case it was 489 inch's so 489 inchs anything longer it will hit front to rear now for viewing you might want to go smaller but that is the max size the rest is your preference.

Train length and curve negotiation is more a function of your driving skills and weight placement within the train than the diameter of the curves themselves. I used to pull 50 car trains around a modular layout with 072 curves. When you do that, you start to notice the laws of physics, especially inertia.

Is there a reason that you used MTH RealTrax in SCARM?   Is the loop squared off for some reason?

The reason that ask is that I would suggest a balloon with Ross #5 switches for a high speed return loop.

It's actually drawn with MTH ScaleTrax and I redid it in GarGraves using O80 curves and O72 turnouts. I couldn't make it connect with sectional tracks and had to use 3 O72MU (makeup) tracks (in red) to get as close as I did. I also redid it using O89 curves and also couldn't make it connect with sectional tracks. Lengths are around 418" and 428" respectively.

For some reason I can't open the .scarm file.  I have SCARM 0.9.31 (should be newest).  Are you using an order file?

Same as mine Ron (0.9.31beta). I just download the file and it opened without a problem for me. I'll email you a copy and see if that works.

I drew it in mth because that is what I planned on using.

But my LHS only had 72.  So I was going to use 72 mth 

But I checked prices. GG was cheaper. And I have a lot of GG USED from.a prior deal.

The scarm plan is misleading. Sorry. It was only used as a guide to see what will fit.

This will run along the soffit that hides the beam that supports my house.

There will be a double line feed that will allow for longer trains than 489" or 40 feet.

I do like the notion that ones ability can overcome the LAWS OF NATURE...but I know it cannot, at least not in the world of model trains, and it seems bigboy 4000, knew it too, sort of....made me laugh..thanks.

"function of your driving skills and weight placement within the train than the diameter of the curves themselves."  

" When you do that, you start to notice the laws of physics, especially inertia."

I drew it in mth because I was going to use mth fixed curves, I considered using my GG and making my own...but too labor intensive.

It is squared off because it is running along the soffit, abive my head.  The only purpose of this is to give me a place to send a train, a long train, on a jorney.  Also,since I have 150 cars, and only about room for 200, end to end, on existing trackage...I GOT NO PLACE TO ACTUALLY RUN A TRAIN.  And the option I prefer is to ADD ON. Also, my wife sort of told me not to, so I HAVE TO.

Side note, Rain in Missouri..basement flooded, got few train set boxes wet...****ED ME OFF.  Laminate floor buckling.  More work I will have to do.

Sump pump died. Third time. First time 2001, then 2008 now 2015.

7 years, in my swamp, then they burn out.  I have done everything I can to resolve water issues...but no one wins against this amount of rain in this short of time...  Fortunately insurance covers it. And MONEY makes everything better.