4-Way Train Crossing
This 4-way crossing is compatible with the current Lego train tracks and will allow one to build more complex train layouts. Simple click your train tracks to the ends*.
*Note, rest of the train track needs to be elevated by one brick height, simply by attaching bricks to the bottom of the train track railroad ties/sleepers.
[i]Update: I have added extra pieces to the corners to further stabilize any possible movement of the corner panels (part 6231).