Web Train

Press "Demo" to see an example layout.
To move a track, click near its midpoint, then drag the track.
To rotate a track, click near either endpoint, then move the mouse either clockwise or counter-clockwise around the other endpoint.
A red circle means that the track is not connected with another track.
A green circle means that the track is connected.
Switches are a little bit tricky. You can't run the train until you have created a layout which returns you to the track where you started in the same direction you started. (You don't have to use all the track.)