Thanks to all of you. If you look at C and D they are "Y" shaped. At the narrow end you just connect another. The other end is like a rail and a half wide but still has only two rail connectores which are way apart. What is the deal here? What do you connect to this? The tracks are not even paralell.
How do you connect the rails like 5c when the the connected rails are 4 rails apart? I cant sEEM todo it with the second rail at such a large angle.