Welcome to iRunTrains, our 3D model railroad simulation app for iPad, iPhone, and Mac.  You can think of iRunTrains as a virtual model train-set that lets you control the speed and direction of up to three trains on a virtual layout. Several layouts are included. Operate and view your trains in a variety of fun ways.  Just like the real thing, except it takes up no space, the track never gets dirty, and the trains never wear out.  :-)