track layout soft wear for a MAC???

I think RailModeler Express is a free limited version and RailModeller Pro is the purchased version with all the options. 

Both work on a Mac.  Available from the I Tunes Store

Google it.

Try the free version first, then you can buy the full version if you like it.

I like Railmodeler.   I upgraded to the Pro version after checking out the free version.

Thanks..I'll give it a try..

I've used railmodeller pro quite a bit and it's a decent program but it's not the only program available.  Empire Express is a simple line drawing program but it has a shorter learning curve.    I tend to use Empire Express for HO and smaller scales but I have used it in the past for O scale with success, you just have to be self aware of track spacing. 

I tried several times to buy Railmodeler Pro but when I go to the RM website and click on the "go to AppleMac store" link my Mac goes crazy and starts to open hundreds of windows.

Has anyone else found this problem?

I haven't had that issue.   Have you tried just opening the app store on your computer and searching for Railmodeller Pro instead of using the direct link?

You can use SCARM if you install it with PlayOnMac, that's what I do.  There is also XTrackCAD.  

I am using RailModeller Pro without problem (except those I create for myself trying to close the gaps on tracks.)

I dig it.

I use RRTrack v5 in Windows7 using Parallels Windows emulator for the MAC OS. Works great.