I' d like to introduce to you my model railroad design application TRAX. It is the first and only web based program of it's kind and it is totally free. You find it at www.traxeditor.com
A few of the many TRAX features: - It works on all computers that are equiped with a modern browser, like Windows PC's, iMacs and Linux machines. I'm trying also to get it working well on Android and iOS devices. - Easy dragging, attach and detach track sections - Use colors for separate sections or area's. Complete with nice legend - Make snapshots of your design and save it as png,jpg or gif. - Surface over 100 by 100 kilometers possible. - Share your design. Get comments from fellow TRAX-users or allow others to copy it. - A viewer that allows you to embed your layout design on your own website or on model railroad fora. - Share layouts you like with your friends using Twitter-, Facebook- and Google+buttons. - 100% Free. - Over 30 track programs already available. And if you are missing one, let me know and I will try my best to get it in. - Scalable background image to help you modelling from satellite images or other track plans.