Make 2 trains pass through on 1 railway. Blue train to right and yellow train to left.
There are 2 sidetracks.
Only 1 train can enter in each sidetrack.
If 2 trains exist in the same sidetrack, you cannnot switch crossing point.
You can move enginetrain(pentagon) by mousedrag.
You cannot move train without engine(rectangle).
you can switch crossing point by click near crossing point.
You can connect trains by drag near enough(white rectangle)
You can unconnect trains by mouse click near the connective point.
You cannot make link in front of engine train.