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[Diligence109]

When you have a T intersection of rails you can power the rail at the intersection by powering it or the block it is attached to via redstone wire or torch and it will switch between it's two possible positions whether it is powered or unpowered. Through the use of buttons with delays, buttons with RS NOR latches, or a switch you can effectively use it as a controllable intersection.

If you have any more questions or want, I could write up a redstone tutorial on various train station building methods. Drop me a PM or visitor message and I'll do it up in a new thread so that we don't derail this one (pun intended).